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  • ASTRONOMY  (899)
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  • 1980-1984  (473)
  • 1975-1979  (426)
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  • 1982  (473)
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  • 1
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    Toward diffraction-limited seeing of dim astronomical objects from the Earth's surface using LIDAR (1977)
    In:  CASI
    Details
    Publikationsdatum: 2005-02-28
    Schlagwort(e): ASTRONOMY
    Materialart: Res. in the Space Sci., Vol. 2, No. 1; 12 p
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  • 2
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    The High Resolution Spectrograph for the Space Telescope (1982)
    In:  CASI
    Details
    Publikationsdatum: 2009-11-16
    Beschreibung: The High Resoltuion Spectrograph (HRS) in conjunction with the Space Telescope (ST), extends ultraviolet astronomical spectroscopy to higher spectra, spatial, and time resolutions than previously achieved, as well as to fainter and more distant celestial objects. Other significant advances inherent in the instrument are high photometric accuracy and efficient operation via exposure meter control and real time rejection of bad data. These capabilities are provided to accomplish the scientific programs of the HRS investigation definition team, which concern the interstellar medium, stellar winds, and evolutionary aspects of stellar atmosphere studies; the determination of chemical abundances relevant to stellar evolution; the investigation of quasars and Seyfert galaxy nuclei; and the analysis of the atmospheres of solar system objects, including comets.
    Schlagwort(e): ASTRONOMY
    Materialart: Space Telescope Science Inst. The Space Telescope Obs.; p 76-105
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  • 3
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    Infrared astronomy and high energy astrophysics (1977)
    In:  CASI
    Details
    Publikationsdatum: 2006-08-09
    Beschreibung: Observations of the diffuse far-infrared flux from the galactic plane, as well as far-infrared measurements of the properties of dense molecular clouds, when combined with recent high-energy gamma-ray measurements and radio observations of carbon monoxide, yield information about the total mass of molecular clouds, the large-scale structure of the inner galaxy, and the density of cosmic rays.
    Schlagwort(e): ASTRONOMY
    Materialart: The Struct. and Content of the Galaxy and Galactic Gamma Rays; p 203-214
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  • 4
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    Reflections on the Space Telescope (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: The significance of the Space Telescope for the advancement of astronomy and astrophysics is described. The current state of knowledge in astronomy and cosmology is summarized and unanswered questions in those fields discussed. The rapid evolution of modern astronomy and the need for systematic observations are stressed.
    Schlagwort(e): ASTRONOMY
    Materialart: Space Telescope Science Inst. The Space Telescope Obs.; p 121-134
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  • 5
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    Astrometric observations with the Space Telescope (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Astrometry with the Space Telescope (ST) is performed using one of the fine guidance sensors (FGS). The FGS, which is based on a pair of Koester's prism interferometers, one for each axis, is capable of measuring the position of one object relative to another with an accuracy of 0.002 arcseconds. Astrometric Data Reduction Software (ADRS) available to the astrometric user of ST is described. The kinds of problems the space telescope astrometry team plans to investigate using ST are discussed.
    Schlagwort(e): ASTRONOMY
    Materialart: Space Telescope Science Inst. The Space Telescope Obs.; p 114-120
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  • 6
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    The wide field/planetary camera (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: A wide site of potential astronomical and solar system scientific studies using the wide field planetary camera on space telescope are described. The expected performance of the camera as it approaches final assembly and testing is also detailed.
    Schlagwort(e): ASTRONOMY
    Materialart: Space Telescope Science Inst. The Space Telescope Obs.; p 28-39
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  • 7
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    European astronomy and the Space Telescope: The Space Telescope European Coordinating Facility (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: The role of the European Coordinating Facility is described. European participation in the Space Telescope Science Institute and the relation of Space Telescope to ground-based astronomy in Europe are discussed.
    Schlagwort(e): ASTRONOMY
    Materialart: Space Telescope Science Inst. The Space Telescope Obs.; p 16-19
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  • 8
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    The High Speed Photometer for the Space Telescope (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: An overview of the high speed photometer (HSP), its optics and detectors, its electronics, its mechanical structure, and some observational considerations are presented. The capabilities and limitations of the HSP are outlined.
    Schlagwort(e): ASTRONOMY
    Materialart: Space Telescope Science Inst. The Space Telescope Obs.; p 106-113
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  • 9
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    The Faint Object Camera (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: The Faint Object Camera fully exploits the spatial resolution capability of the Space Telescope on the very faintest detectable objects over a broad wavelength range. A full complement of filters, objective prisms and polarizers, a choice of coronograhic masks, and a variety of scan formats extend the scientific versatility of the direct imaging mode. In addition, the Faint Object Camera provides the unique facility of long-slit spectroscopy to Space Telescope observers.
    Schlagwort(e): ASTRONOMY
    Materialart: Space Telescope Science Inst. The Space Telescope Obs.; p 40-54
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  • 10
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    Astronomical capabilities of the Faint Object Spectrograph on Space Telescope (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Examples of scientific observing programs planned with the Faint Object Spectrograph on Space Telescope are presented. An overview of the spectrograph design and operation is presented. The expected astronomical performance of the instrument is described in some detail.
    Schlagwort(e): ASTRONOMY
    Materialart: Space Telescope Science Inst. The Space Telescope Obs.; p 55-75
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  • 11
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    The Space Telescope Observatory (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: The history of the observatory is briefly described, as is the overall system design. The principal design features that are important to the scientific user are described. The present status of preparation for launch in the spring of 1985 is summarized.
    Schlagwort(e): ASTRONOMY
    Materialart: Space Telescope Science Inst. The Space Telescope Obs.; p 20-27
    Format: text
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  • 12
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    Science operations with Space Telescope (1982)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: The operation, instrumentation, and expected contributions of the Space Telescope are discussed. Space Telescope capabilities are described. The organization and nature of the Space Telescope Science Institute are outlined, including the allocation of observing time and the data rights and data access policies of the institute.
    Schlagwort(e): ASTRONOMY
    Materialart: The Space Telescope Obs.; p 1-15
    Format: text
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  • 13
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    General-altitude transformations between geocentric and geodetic coordinates (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: Formulas for the general-altitude (height above the ellipsoid) transformation from geocentric to geodetic coordinates and vice versa are derived. The set of four formulas is expressed in each of two useful forms: series expansions in powers of the earth's flattening and series expansions in powers of the earth's eccentricity. The error incurred in these expansions is of the order of one part in 30 million.-
    Schlagwort(e): ASTRONOMY
    Materialart: Celestial Mechanics; 12; Sept
    Format: text
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  • 14
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    La Posta Astrogeophysical Observatory (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: An overview is presented of the equipment and data acquisition procedures at La Posta Astrogeophysical Observatory, located in the mountains, east of San Diego, Calif. It is a solar observatory, focusing on solar flares and the effect of solar activity on earth. It makes daily radio and optical observations of solar activity. Radio transmission in the earth atmosphere is monitored with VLF and HF equipment. A magnetometer monitors the state of the geomagnetic field.
    Schlagwort(e): ASTRONOMY
    Materialart: Solar Physics; 43; July 197
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  • 15
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    Airborne infrared astronomy (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: After a brief review of the general procedures involved in airborne infrared astronomy and of the historical background leading up to this important new technique, sources of infrared radiation, effects of the earth's atmosphere on this incoming radiation, methods of detection of infrared sources, and the development of airborne observatories are described. The discussion is on a lay level; the correlation of heat with infrared emission, the primary role played by CO2 and H2O in the opacity of the atmosphere in the IR above 18 microns, the use of a crystal to electronically detect radiation in the desired spectral region, and the Lear Jet telescope as mounted in a modified C-141 cargo jet are considered.
    Schlagwort(e): ASTRONOMY
    Materialart: Mercury; 4; July-Aug
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  • 16
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    High-energy gamma-ray astronomy (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The subject of gamma-ray astronomy is discussed with emphasis on celestial gamma rays with energies in excess of 10 MeV. Early observations of such gamma rays are reviewed, a gamma-ray spark-chamber telescope is described together with a gas Cerenkov-counter telescope, and the gamma-ray sky is delineated. It is shown that the diffuse high-energy gamma radiation from the galactic plane probably results primarily from cosmic-ray interactions with interstellar matter. Mechanisms for gamma-ray production are identified, and it is noted that the general galactic radiation may prove to be of great value in studies of galactic structure. Possible sources are considered for the diffuse celestial radiation, and discrete sources are described, including the Crab pulsar, the Vela remnant, the Cygnus region, and Gould's Belt. Future developments in gamma-ray astronomy are considered.
    Schlagwort(e): ASTRONOMY
    Materialart: Physics Today; 28; Sept
    Format: text
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  • 17
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    Mariner 9 observations of beta Cephei stars (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Ultraviolet spectra of three beta Cep variables and a nonvariable star of similar spectral type were observed by the ultraviolet spectrometer on Mariner 9. A significant light variation at 1400 A may have been detected for beta Cep. The variable stars have mean ultraviolet spectra similar to that of the nonvariable star and do not show any significant short-period spectral variations.
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomical Society of the Pacific; vol. 87
    Format: text
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  • 18
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    Scientific instrumentation of the Radio-Astronomy-Explorer-2 satellite (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The instrumentation of the RAE-2 spacecraft is described. The instruments include a pair of long travelling-wave antennas, a 37-m dipole, two radiometers making one frequency scan every 144 sec, and two rapid-sampling total-power burst receivers which cover the range from 0.025 to 13.1 MHz in 32 discrete steps. Effects of terrestrial noise on RAE-1 and RAE-2 observations are discussed, and it is noted that RAE-2 is uniquely capable of observing repeated lunar occultations of strong radio sources at very low frequencies. Some observational programs are briefly noted, including observations of the galactic background distribution, measurements of lunar occultations of solar radio bursts, and searches for more radio sources among the planets, galactic objects, and extragalactic sources.
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomy and Astrophysics; 40; 4, Ma; May 1975
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  • 19
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    Soft X-ray emission from Hercules X-1 (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; 199; July 15
    Format: text
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  • 20
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    Period changes in Centaurus X-3 (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: A number of mechanisms which can change the orbital period are applied to various models of Cen X-3. Only four models which give rise to feasible mechanisms are found. Possible observations which could distinguish between these models are suggested.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; 199; July 15
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  • 21
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    The light curve of CV Serpentis, the sometimes-eclipsing Wolf-Rayet star (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: New photoelectric observations of the B-magnitude of CV Ser made in 1973 and 1974 show no clear evidence of an eclipse, but they establish night-to-night variability of several percent, a systematic brightness change of 0.035 mag during a portion of the single orbit observed in 1973, and irregular flaring in 1974. We made iris photometer measurements of Harvard patrol plates taken between 1905 June and 1953 July, and find no evidence of a very deep eclipse such as observed by Hjellming and Hiltner. We present several new light curves and discuss then in the light of the recent results of Cowley et al.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; 199; July 15
    Format: text
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  • 22
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    The spectrum of HD 125823 /a Centauri/ (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; 199; July 1
    Format: text
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  • 23
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    Conclusions from the discussions on observational results of heterodyne spectroscopy in astronomy (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Experimental results in astronomy obtained with the aid of infrared heterodyne detection techniques are considered, taking into account the detection of thermal emission with no dispersion at the intermediate frequency and observations involving molecular line detection. The tuning range of a heterodyne spectrometer and of a Fourier transform spectrometer is considered and attention is given to the selection of the appropriate technique for a specific investigative problem.-
    Schlagwort(e): ASTRONOMY
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  • 24
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    Heterodyne spectroscopy of astronomical and laboratory sources at 8.5 microns using diode laser local oscillators (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The first 8.5 microns infrared heterodyne spectrometer has been constructed using tuneable semiconductor (PbSe) diode lasers and was used to measure absorption line profiles of N2O in the laboratory, as well as black-body emission from the moon and from Mars. Spectral information was recorded over a 200 MHz bandwidth using an 8-channel filter bank. The resolution was 25 MHz (6 millionths of a micron), and the minimum detectable (black-body) power was approximately 1 times 10 to the minus 16th power W for 8 min of integration. The results demonstrate the usefulness of heterodyne spectroscopy for the study of remote and local sources in the infrared.
    Schlagwort(e): ASTRONOMY
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  • 25
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    Studies of the infrared source CRL 2688 (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Infrared, optical, and radio observation are described of a newly discovered galactic infrared source. Most of the radiation comes from a 1.''5 diameter infrared source at a temperature of about 150 K, but some visible emission in the form of a symmetrical highly polarized reflection nebulosity is also seen. The object could represent either a very early or a very late stage in stellar evolution.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; 198; June 15
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  • 26
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    The eclipsing binary CW Eridani (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Results of three-color photoelectric observations of CW Eridani are presented which were made with a 30-inch telescope over the three-year period from 1970 to 1973. The times of minima are computed, solutions of the light curves are obtained, and theoretical light curves are computed from the solutions. The period is determined to be 2.72837 days, and the orbital and photoelectric elements are derived from solutions based on the idealized Russell model.
    Schlagwort(e): ASTRONOMY
    Materialart: Acta Astronomica; 25; 2, 19; 1975
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  • 27
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    Shadow of the head of Comet Kohoutek (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: An earlier reported shadow of the head of Comet Kohoutek (1973f) was not found in later photographs of the comet. However, linear dark areas were seen and are described as the space between the plasma and the dust tails. The discrepancy in earlier observations is attributed to low resolution in them. Observation of a shadow is also discounted in terms of cometary physics, due to low dust content and the weakness and curvature of the dust tail.
    Schlagwort(e): ASTRONOMY
    Materialart: Nature; 253; Feb. 20
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  • 28
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    A statistical technique for processing radio interferometer data (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The output of a radio interferometer is the Fourier transform of the object under investigation. Due to the limited coverage of the Fourier plane, the reconstruction of the image of the source is blurred by the beam of the synthesized array. A maximum-likelihood processing technique is described which uses the statistical properties of the received noise-like signals. This technique has been used extensively in the processing of large-aperture seismic arrays. This inversion method results in a synthesized beam that is more uniform, has lower sidelobes, and higher resolution than the normal Fourier transform methods. The maximum-likelihood method algorithm was applied successfully to very long baseline and short baseline interferometric data.
    Schlagwort(e): ASTRONOMY
    Materialart: IEEE Transactions on Antennas and Propagation; AP-23; Jan. 197
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  • 29
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    Stabilization of Kepler's problem (1977)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: A regularization of Kepler's problem due to Moser (1970) is used to stabilize the equations of motion. In other words, a particular solution of Kepler's problem is imbedded in a Liapunov stable system. Perturbations can be introduced into the stabilized equations.
    Schlagwort(e): ASTRONOMY
    Materialart: Celestial Mechanics; 16; Sept
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  • 30
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    Aperture averaging effects in stellar scintillation (1977)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Stellar scintillation has been measured for apertures as low as 0.012 m by using photoncounting techniques. The scintillation measurements have been made for various aperture sizes in quick succession in order to determine experimentally the effects of aperture averaging. The results of the experiment are compared with the predictions of a model proposed earlier in the literature to quantify the phenomenon.
    Schlagwort(e): ASTRONOMY
    Materialart: Optics Communications; 22; Sept
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  • 31
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    Far-infrared scans of the Galactic plane (1977)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Results are reported for balloon-borne scans of the Galactic plane between longitudes of 348 and 32.5 deg, which were made in two broad spectral bands from 60 to 300 microns and from 150 to 300 microns. These results indicate that there are many bright H II regions embedded in a diffuse underlying band of emission in the examined longitude range, that the color temperatures range from 30 to 90 K, and that the width of the plane is at least 2 deg of arc in both spectral bands. A lower-limit IR luminosity of the order of 1 billion suns is computed for both the bright complex of sources at the nucleus and the underlying diffuse emission out to about + or -15 deg of arc from the nucleus. The strong relationship between far-IR emission and radio continuum expected for discrete sources is illustrated, and the results are compared with those of previous studies. It is concluded that the total far-IR luminosity of the central part of the Galaxy is understandable solely in terms of known distributions of stars and dust.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 214
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  • 32
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    90-GHz flux-density measurements of variable radio sources (1977)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Results are presented for measurements of the flux densities of 10 variable extragalactic sources at 85.2 or 90 GHz, which were made over a period of almost seven years with the NRAO 36-ft millimeter-wave antenna. The primary flux-density calibration standards used include Jupiter, Saturn, Mars, and the small-diameter Galactic source DR 21. Measured flux densities are given as a function of time (in years) for the sources 3C 84, NRAO 150, 3C 120, OJ 287, 4C 39.25, 3C 273, 3C 279, 3C 345, BL Lac, and 3C 454.3. No statistically meaningful flux-density changes during an observing interval (1 to 3 days) are detected for any source, and a high degree of correlation between flux-density variations at 85.2 or 90 GHz and those observed at lower frequencies is found in all 10 sources. Some variations observed at different frequencies in several individual sources are briefly discussed.
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomical Journal; 82; Apr. 197
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  • 33
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    Copernicus observations of the Ap star Epsilon Ursae Majoris (1977)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Spectral scans of the Ap star Epsilon UMa made with the Copernicus satellite show strong line blanketing from profuse Cr II and Fe II lines. In the spectral region covering 1900 to 3000 A, about 500 lines are present which suppress the apparent continuum by at least 15-30%. An accurate line-identification list is compiled showing Eu II present in addition to Mn II and Ni II. The identification of Eu II, however, rests on very stringent identification limits for Fe II. If these are relaxed, the existence of Eu II is dubious. There are no broad features in this spectral region which would suggest strong photoionization discontinuities by metals, but one feature near 2137 A might contain the photoionization edge due to Cr I 5S lying 0.94 eV above the ground level. However, a significant correlation between the line-blanketing strength and the amplitude of the OAO-2 ultraviolet light curves was found such that both monotonically increase in the same proportion toward shorter wavelengths. This gives additional strength to the suggestion that variations in the metal line-blanketing cause the observed photometric variations.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal Supplement Series; 33; Jan. 197
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  • 34
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    5 GHz observations of galactic supernova remnants (1977)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Brightness and polarization distributions over several galactic supernova remnants have been observed at a wavelength of 6 cm. These observations have confirmed the nonthermal nature of most of the observed sources. It is suggested, however, that the objects G33.1-0.1 (KES 78), G35.6-0.0, G37.6-0.1, G37.7+0.1, and G37.9-0.4 are thermal. The results of these observations are presented in the form of total intensity contour maps with superimposed polarization vectors.
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomy and Astrophysics; 55; 1, Fe; Feb. 197
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  • 35
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    Far-ultraviolet imagery of the Barnard Loop Nebula (1977)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: An electrographic Schmidt camera carried on a sounding rocket has yielded far-ultraviolet (1050-2000 A and 1230-2000 A) images of the Barnard Loop Nebula and of the general background in the Orion region due to scattering of ultraviolet starlight by interstellar dust particles. The total intensity in the Barnard Loop region agrees well with OAO-2 measurements, but the discrete Loop structure contributes only some 15% of the total. The measurements are consistent with a relatively high albedo for the dust grains in the far-ultraviolet.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 212
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  • 36
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    Apollo-16 far-ultraviolet spectra in the Large Magellanic Cloud (1977)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Spectra in the wavelength ranges from 900 to 1600 A and 1050 to 1600 A of some OB associations in the Large Magellanic Cloud were obtained from the lunar surface by the Apollo-16 far-ultraviolet camera/spectrograph on April 22, 1972. The observed spectral distributions appear consistent with a stellar model having an effective temperature of 30,000 K, reddened by E(B-V) = 0.3, and characterized by the average far-ultraviolet extinction curve of Bless and Savage (1972). However, the absolute intensity of the far-ultraviolet spectrum of the associations NGC 2050 and 2055 seems somewhat too bright in comparison with ground-based photometry.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 211
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  • 37
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    Far infrared observations of IRC + 10216 (1977)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Results are reported for measurements of IRC + 10216 at 100 microns made with the 91-cm telescope of NASA's Kuiper Airborne Infrared Observatory. The IR photometer employed consisted of a gallium-doped germanium photoconductive detector with a MOSFET preamplifier and load resistor. Signals obtained from the source at modulation frequencies of 30 and 100 Hz are plotted, and the 100-micron flux measurements are shown to be in agreement with previous bolometric measurements. It is noted that the sensitivity of the photoconductive detection system is comparable to that of the conventional bolometers that have been used in airborne IR observations.
    Schlagwort(e): ASTRONOMY
    Materialart: Nature; 265; Feb. 10
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  • 38
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    The SAS-3 X-ray observatory (1975)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The experiment section of the Small Astronomy Satellite-3 (SAS-3) launched in May 1975 is an X-ray observatory intended to determine the location of bright X-ray sources to an accuracy of 15 arc-seconds; to study a selected set of sources over a wide energy range, from 0.1 to 55 keV, while performing very specific measurements of the spectra and time variability of known X-ray sources; and to monitor the sky continuously for X-ray novae, flares, and unexpected phenomena. The improvements in SAS-3 spacecraft include a clock accurate to 1 part in 10 billion, rotatable solar panels, a programmable data format, and improved nutation damper, a delayed command system, improved magnetic trim and azimuth control systems. These improvements enable SAS-3 to perform three-axis stabilized observations of any point on the celestial sphere at any time of the year. The description of the experiment section and the SAS-3 operation is followed by a synopsis of scientific results obtained from the observations of X-ray sources, such as Vela X-1 (supposed to be an accreting neutron star), a transient source of hard X-ray (less than 36 min in duration) detected by SAS-3, the Crab Nebula pulsar, the Perseus cluster of galaxies, and the Vela supernova remnant.
    Schlagwort(e): ASTRONOMY
    Materialart: APL Technical Digest; 14; Oct
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  • 39
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    UBV and JHKL photometry of the radio star UX Ari = HD 21242 (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Schlagwort(e): ASTRONOMY
    Materialart: Acta Astronomica; 25; 2, 19; 1975
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  • 40
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    Observing prospects for Halley's comet (1975)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The expected path and brightness development of Halley's comet soon before and after its perihelion on February 9, 1986 are described. It is concluded that the comet will prove disappointing to most U.S. observers, since it is not expected to equal Kohoutek in peak magnitude (and since this latter comet was disappointing to the general public). Moreover, Halley's comet will be brightest (3rd magnitude) in the southern hemisphere, and increased outdoor lighting by the year 1986 will probably obscure its tail near cities.
    Schlagwort(e): ASTRONOMY
    Materialart: Sky and Telescope; 49; June 197
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  • 41
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    Photometric detection of extrasolar planets using L.S.T.-type telescopes (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Detection of planets similar to the earth and Jupiter that might be circling nearby stars is possible with the large space telescope (LST), or modifications of this instrument. The use of the moon as an occulter to increase the signal-to-noise ratio and the expected photon fluxes from hypothetical planetary companions to alpha Centauri A and B, tau Ceti, and epsilon Eridani are discussed. Because Barnard's Star is a red dwarf of visual apparent magnitude 9.5, photometric detection of its hypothetical Jupiter-like companion would be difficult using the LST-occulter system described in this paper.
    Schlagwort(e): ASTRONOMY
    Materialart: British Interplanetary Society; vol. 28
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  • 42
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    Binary galaxy orbit statistics. I - Fixed mass and major axis (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Averages for the projected separation, squared radial velocity difference, and the product of these, are presented for a binary galaxy system of fixed mass and major axis, but any orbital eccentricity. The average of the product varies by a factor about 3 for eccentricities from 0 to 1.0. For circular orbits, the results agree with those of Page (1952, 1960, 1961), but for linear orbits his mass estimate is too small by a factor 6. The mutual regressions of the velocity and separation on each other are calculated, and are presented in such a way as to exhibit the relative likelihood of occupation of the different parts of the regression curves. 'Isopleths' for the probability distribution are presented for a few values of the eccentricity to illustrate the underlying cause of pileup at certain parts of the regression curves. It is concluded that previous analyses were inadequate for failing to take into account that the regression curves represent in many cases a distribution that is almost wholly depopulated through most of the range. It is evident that the data are insufficient to draw a firm conclusion about the distribution of eccentricities.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; 197; May 1
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  • 43
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    Photometry of a bright filament in the Orion nebula (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The spectrum of a bright filament in the outer portion of the Orion nebula, 14 min from the Trapezium, was studied. The temperature of the filament, derived from /N II/ lambda 5755/6583 ratio, is 9560 K. The electron density (from /S II/ lambda 6717, 6731) is low: 360 plus or minus 150 per cu cm. The ionic abundances of He(+), N(+), O(++), and S(-) are about the same as Peimbert and Costero (1969) found in regions in Orion closer to the Trapezium. It is concluded that the filament is photoionized, presumably by the Trapezium, rather than a shock front, as had originally been suspected.
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomical Society of the Pacific; vol. 87
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  • 44
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    Interstellar scintillation of extragalactic radio sources (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Observations of 12 compact extragalactic sources were made at 2695 and 8085 MHz in order to detect weak intensity fluctuations caused by interstellar scintillation. Pulsar data are used to estimate the parameters of the interstellar medium needed to interpret the measured upper limits in terms of source angular diameters which are much larger than the scintillation cutoff diameter. It is shown that the observed source rms brightness temperatures are less than 10 to the 15th K and 10 to the 14th K at 2695 and 8085 MHz, respectively, making self-absorbed proton-synchroton radiation and high-brightness coherent mechanisms unlikely. If the sources are composed of 'point' components, each source can contain no fewer than 10,000 such components.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; 197; Apr. 1
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  • 45
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    Aperture synthesis observations of galactic H II-regions (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Aperture synthesis observations at 2.695 GHz and 8.085 GHz of the H II regions NRAO 591, NGC 6857, NGC 7538, M8, W3 and W49A made with the NRAO interferometer are presented. A set of Gaussian functions is derived to describe the radiation distribution of each H II region at each frequency. Fine structure is found in all regions. With the exception of the extended source in W49A, all previously known sources with high excitation parameters are resolved into smaller sources. The electron densities of individual sources range from 100 per cu cm up to 100,000 per cu cm. In NGC 6857, NGC 7538 and W49A, continuum sources smaller than 4 arc sec and with electron densities exceeding 10,000 per cu cm are found close to the known class II OH emission sources. In M8, we find a ring which seems to be split at the position of the O-star Herschel 36.
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomy and Astrophysics; 38; 1, Ja; Jan. 197
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  • 46
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    On angular momentum transfer in binary systems (1975)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The maximum limit for the conversion of orbital angular momentum into rotational angular momentum of the mass-gaining component in a close binary system is derived. It is shown that this conversion process does not seriously affect the rate of orbital period change and can be neglected in computing the mass transfer rate. Integration of this limit over the entire accretion process results in a value for the maximum accumulated rotational angular momentum that is 3 to 4 times larger than that implied by the observed underluminosity of stars in such systems as Mu(1) Sco, V Pup, SX Aur, and V356 Sgr. It is suggested that shell stars and emission-line stars in binary systems may be produced when the core angular momentum is transferred into an envelope having a rotational angular momentum close to the maximum limit.-
    Schlagwort(e): ASTRONOMY
    Materialart: Royal Astronomical Society; vol. 170
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  • 47
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    Gamma ray astronomy (1975)
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    Publikationsdatum: 2011-08-16
    Beschreibung: A survey of the instruments developed for gamma ray astronomy is given together with a brief summary of the current status of the observational results. These include the studies of galactic gamma ray emission, the diffuse, presumably extragalactic, gamma radiation, and localized gamma ray sources. The study of the spatial distribution of galactic gamma radiation is beginning to provide a new means for the study of galactic structure and dynamics. The diffuse emission may provide evidence of gamma ray emission in the cosmological past, although improved observations must be obtained before the picture can be clarified. The study of localized sources has shown NP0532, the Crab radio pulsar, to be a gamma ray pulsar also and strong emission from Vela may be due to supernova produced cosmic rays interacting with the remnant gas.
    Schlagwort(e): ASTRONOMY
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  • 48
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    Counterglow from the earth-moon libration points (1975)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Results from the OSO-6 Rutgers Zodiacal Light Analyzer experiment show photometric perturbations above the background in the antisun line of sight. Sixteen successive lunations were examined, and the accumulated perturbations show a maximum value in the direction of the L4 and L5 earth-moon libration points. This is interpreted as a counterglow from a cloud of particles at the libration points. The average brightness of these libration clouds is 20 S10 Vis. The average angular size of the libration clouds is approximately 6 degrees. Their position varies from one lunation to the next, within an ellipsoidal zone centered on the libration-point direction, with its semimajor axis, of approximately 6 degrees, nominally in the ecliptic and its semiminor axis, of approximately 2 degrees perpendicular to the ecliptic. The position of these clouds with respect to the Lagrangian L4 and L5 points is towards the moon in the northern summer and away from the moon in the northern winter.
    Schlagwort(e): ASTRONOMY
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  • 49
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    X-ray and gamma-ray astronomy (1975)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Accomplishments in the fields of X-ray and gamma ray astronomy are discussed. Data obtained from IMP and OGO satellites are analyzed to determine the sources of interplanetary radiation bursts. The energy spectrum of cosmic gamma ray bursts as observed by IMP-6 is described. The application of cooling blackbody techniques as a method for examining cosmic gamma ray bursts is reported. The experimental results and theoretical interpretation of high energy diffuse gamma rays are investigated. The structure of the SAS-2 satellite is depicted and the accomplishments are examined. Other sources of gamma radiation to include galactic fermi, Cygnus X-1, supernovae, and the planet Jupiter are proposed. Data obtained from the Pioneer 10 space probe are presented in graph form.
    Schlagwort(e): ASTRONOMY
    Materialart: Significant Accomplishments in Sci. and Technol.; p 34-91
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  • 50
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    Cometary Physics (1975)
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    Publikationsdatum: 2011-08-16
    Beschreibung: A history of comets and cometary observations is presented. Emphasis is placed on the observations and characteristics of the Comet Kohoutek. A schematic drawing of a comet is included to show the structure of the nucleus, coma, dust tail, ion tail, and natural hydrogen cloud. A joint observatory for cometary research, located in New Mexico, is described. Observations of magnetic fields in comets are analyzed. Infrared spectral observations of comet structure in the 10 micron atmospheric window are reported.
    Schlagwort(e): ASTRONOMY
    Materialart: Significant Accomplishments in Sci. and Technol.; p 2-33
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  • 51
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    Submillimetre astronomy from space platforms (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: The scientific need and the technical feasibility of a 10-m class far infrared telescope in space were studied and culminated in the recommendation of the large deployable reflector (LDR). The scientific considerations for such a project are described and the general characteristics of LDR are derived. A scientific program culminating in LDR is suggested.
    Schlagwort(e): ASTRONOMY
    Materialart: ESA The Sci. Importance of Submillimetre Observations ap 91-96 (SEE N83-22034 11-88)
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  • 52
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    A simple criterion for determining the dynamical stability of three-body systems (1982)
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    Publikationsdatum: 2011-08-18
    Beschreibung: Coplanar, prograde three-body systems (TBS) are discussed, emphasizing the specification of general criteria for determining whether such systems are dynamically stable. It is shown that the Graziani-Black (1981) criteria provide a quantitatively accurate characterization of the onset of dynamic instability for values of the dimensionless mass ranging from one millionth to one million. Harrington's (1977) general criterion and the Graziani-Black criterion are compared with results from analytic work that spans a 12-orders-of-magnitude variation in the mass ratios of the TBS components. Comparison of the Graziani-Black criteria with data for eight well-studied triple-star systems indicates that the observed lower limit for the ratio of periastron distance of the tertiary orbit to the semimajor axis of the binary orbit is due to dynamical instability rather than to cosmogonic processes.
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomical Journal; 87; Sept
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  • 53
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    A 1400-MHz survey of 1478 Abell clusters of galaxies (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Observations of 1478 Abell clusters of galaxies with the NRAO 91-m telescope at 1400 MHz are reported. The measured beam shape was deconvolved from the measured source Gaussian fits in order to estimate the source size and position angle. All detected sources within 0.5 corrected Abell cluster radii are listed, including the cluster number, richness class, distance class, magnitude of the tenth brightest galaxy, redshift estimate, corrected cluster radius in arcmin, right ascension and error, declination and error, total flux density and error, and angular structure for each source.
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomical Journal; 87; Aug. 198
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  • 54
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    IUE observations of proto-planetary and variable planetary nebulae. I - V1016 Cygni, HM Sagittae, and HBV 475. II - A search for variability in IC 4997 and NGC 6905 (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The IUE satellite has undertaken UV observations of the proto-planetary nebulae V1016 Cyg, HM Sge, and HBV 475, yielding emission line fluxes, line ratios, line profiles, electron densities, and distances from these objects. While levels of increasing excitation and ionization as a function of time are shown by the data for the first two nebulae, the trend for HBV 475 is found to lead in the opposite direction. The formation of a shell is suggested by dramatic changes in the HM Sge UV line profiles over the last four years, including the disappearance of W-R features and the incipient splitting of the semi-forbidden C III 1909 A line. An additional IUE search for UV variability in the planetary nebulae IC 4997 and NGC 6905 has yielded emission line fluxes, line ratios and profiles, and central star temperatures, as well as stratification effects data for several ions in NGC 6905
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 258
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  • 55
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    Periodic orbits of the elliptic restricted problem for the Sun-Jupiter-Saturn system (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: A systematic approach to generate periodic orbits in the elliptic restricted problem of three bodies is introduced. The approach is based on (numerical) continuation from periodic orbits of the first and second kind in the circular restricted problem to periodic orbits in the elliptic restricted problem. Two families of periodic orbits of the elliptic restricted problem are found by this approach. The mass ratio of the primaries of these orbits is equal to that of the Sun-Jupiter system. The sidereal mean motions between the infinitesimal body and the smaller primary are in a 2:5 resonance, so as to approximate the Sun-Jupiter-Saturn system. The lineaar stabilities of these periodic orbits are studied as functions of the eccentricities of the primaries and of the infinitesimal body. The results show that both stable and unstable periodic orbits exist in the elliptic restricted problem that are close to the actual Sun-Jupiter-Saturn system. However, the periodic orbit closest to the actual Sun-Jupiter-Saturn system is (linearly) stable.
    Schlagwort(e): ASTRONOMY
    Materialart: Celestial Mechanics; 27; May 1982
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  • 56
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    Sky input horn for a far-infrared interferometer (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: A unique design has been developed whereby a compound parabolic concentrator (CPC) and a compound elliptical concentrator (CEC) are joined at their throats. The CPC serves as the field-defining optics, in that it accepts up to a certain maximum acceptance angle and then concentrates this accepted energy at its throat. Energy incident from angles greater than the acceptance angle is rejected. The CEC takes the energy concentrated at the CPC throat and then redirects this energy into a finite-sized pupil a given distance away. The considered design will be used as the sky input horn for a cryogenic far-infrared polarizing interferometer to be flown on NASA's Cosmic Background Explorer satellite. The interferometer will operate at 2 K and measure the 3-K cosmic background radiation of the universe in the 100-micrometer-1-cm spectral range.
    Schlagwort(e): ASTRONOMY
    Materialart: Optics Letters; 7; May 1982
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  • 57
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    Infrared, optical, and ultraviolet observations of hydrogen line emission from Seyfert galaxies (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Nearly simultaneous observations are reported of P-alpha, H-alpha, and H-beta emission from 18 Seyfert galaxies and of Ly-alpha from eight of these galaxies. In many cases, P-alpha is stronger relative to the Balmer lines than is predicted by recombination calculations; reddening appears to be required. Dispersion in the P-alpha/H-alpha/H-beta ratios orthogonal to the reddening track indicates that high densities or optical depths also affect the line flux ratios. Several galaxies, notably NGC 1275, have very low P-alpha/H-alpha ratios. High densities, large optical depths, and reddening probably all contribute to the low observed Ly-alpha/H-beta ratios.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 256
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  • 58
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    Ultraviolet images of M101 - Observations of dust and inferences on the metallicity (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Since extreme Population I dominates three rocketborne telescope UV images of the Sc I galaxy NGC 5457, the delineation of the spiral structure is sharper than that of ground photographs. The UV pictures, in which the H II regions appear as reflection nebulae and illumine the nearby dust, reveal faint arms which, although correlated with the 21 cm H I radiograph, are only marginally detectable on deep visual photographs. The surface brightness of the arms is explainable in terms of UV light scattering off dust from hot stars and bright H II regions, in which case the dust would have extinction properties and a dust-to-gas ratio similar to that in the solar neighborhood and would in addition suggest that the NGC 5457 outer arm metal content is similar to that of the galaxy.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 255
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  • 59
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    VI photometry of selected SAO stars (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Johnson V- and I-band photoelectric photometry has been obtained for 158 SAO stars in a continuing program in support of the Near Infrared Photographic Sky Survey. These data are utilized in the calibration of the survey photographs and are presented here to assist other programs reliant upon access to photometry in the photographic infrared.
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomical Society of the Pacific; vol. 94
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  • 60
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    The double structure of W3-IRS 5 as determined from high-resolution spatial scans (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Slit scans over the infrared source W3-IRS 5, from 4.8 to 12.7 microns are interpreted in terms of two sources of luminosity separated by 0.9 arcsec in declination. The data, as a function of wavelength, show that the two sources must have remarkably similar properties.
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomical Journal; 87; Feb. 198
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  • 61
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    Balloon observations of galactic high-energy X-ray sources (1982)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: A number of X-ray sources were observed with the Naval Research Laboratory hard X-ray observatory during balloon flights on 1976 May 11 and 1977 November 24. The primary objective of the observations was to characterize the temporal and spectral behavior of the sources in the energy range from 20 to 250 keV. Special emphasis was placed on the determination of spectrum versus phase for periodic sources and on the search for spectral features such as the reported 60 keV line in the X-ray spectrum of Her X-1. Results of the observations include: evidence for possible phase-dependent spectral variations in the emission from GX 1+4; flaring in the emission from GX 301-2; detection of unmodulated X-ray emission up to approximately 35 keV from GX 304-1; and an unexpectedly hard spectrum above 20 keV from Cyg X-2.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 254
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    PKS 2155-304 - Relativistically beamed synchrotron radiation from a BL Lacertae object (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The previously reported variability by a factor of two in less than a day is confirmed for the newly discovered BL Lac object PKS 2155-304, by means of the HEAO 1 A-2 experiment's medium- and high-energy detectors. An interpretation of the overall spectrum from radio through X-rays in terms of a synchrotron self-Compton model yields a good description of the data if relativistic beaming is allowed for. The presence of jets is inferred without their direct observation through consideration of the spectrum, combined with an estimate of the size of the source.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 253
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  • 63
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    Mass loss from the central star of the planetary nebulae IC 3568 (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Low resolution IUE spectra of IC 3568 show several stellar P Cygni features. A high resolution spectrum was obtained which shows a saturated N V lambda 1240 profile from which we find the terminal velocity of the tellar wind to be v = 1840 km/s. The P Cygni features due to C IV lambda 1549, O V lambda 1371 and N IV lambda 1719 are also observed. The unsaturated O V lambda 1371 line seems best for determination of the mass loss rate. It is found that the level of ionization in the stellar wind appears to increase outwards. The possible effects of such stellar winds from central stars on surrounding nebulae are discussed.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 610-614
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  • 64
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    The peculiar, luminous early-type emission line stars of the Magellanic clouds: A preliminary taxonomy (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: A sample of some 20 early type emission supergiants in the Magellanic clouds was observed with both the SWP and LWR low resolution mode of IUE. All stars have strong H-emission, some showing P-Cygni structure as well with HeI, HeII, FeII and other ions also showing strong emission. It is found that the stars fall into three distinct groups on the basis of the HeII/HeI and HeI/HI strengths: (1) HeII strong, HeI, HI; (2) HeII absent, HeI, HI strong; (3) HeI absent, HI, FeII, FeII, strong in addition to low excitation ions. The two most extreme emission line stars found in the Clouds S 134/LMC and S 18/SMC are discussed. Results for the 2200A feature in these supergiants, and evidence for shells around the most luminous stars in the clouds are also described.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 602-605
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    Magnetospheres and winds of the helium strong stars: Dependence on rotation (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Large aperture, low resolution spectra of 24 stars of types 05, 04, and 03 were obtained, and from these the energy distribution between 1200 and 3200 angstrom was derived in absolute units. The energies were combined with energies deduced from uvby and UBV photometry and corrected for interstellar extinction. Angular diameters and effective temperatures are also derived. The effective temperatures range from 24800K to 63000K. There is no correlation between effective temperature and spectral type or luminosity class for the early 0 stars. The size of the expected errors are also studied.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 589-592
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    The chromospheric rotation activity relation in late type close binary systems (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The IUE data on 36 late type close binary stars are presented. It is shown that the chromospheric and TR line fluxes increase with decreasing stellar rotation period, though not as rapidly as does the X-ray flux. There is an increasing dependence upon rotation with increasing line temperature. The data are consistent with the hypothesis that there exists a critical rotation rate, which depends on temperature, below which the emission flux is independent of rotation and above which it increases linearly with increasing angular velocity omega.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 566-569
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    Observations of the May 1979 outburst of Centaurus X-4 (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The IUE spectra of the X-ray transient/X-ray burst source Cen X-4 at three intervals during the peak and decline of the May 1979 transient event were studied. The spectrum is characterized by a blue continuum and strong emission lines of N V lambda 1240, Si IV lambda 1398 and C IV lambda 1550. The origin of these emission components in the context of an X-ray dwarf nova model is investigated. It is suggested that an accretion disk plays a prominent role in the generation of the continuum emission and that X-ray heating of the accretion disk and the companion star may be important in the formation of the emission lines.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 558-562
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    Model fitting of the Algol binaries (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Energy distribution of the component stars of the Algol type semidetached binaries were studied by combining IUE low dispersion spectra with optical scans made with the same resolution. In most cases the flux distributions are matched by Kuruz model atmospheres with normal solar composition. Deviations from normal atmospheres which indicate a higher level of activity and interaction in the binaries are examined. Eclipse observations in U Cep and V356 Sgr reveal emission lines of the W serpentis type.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 538-541
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    Observations of mass accretion in binary stars (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Results from high resolution observations of eight close binary stars (TX UMa, U CrB, CX Dra, TT Hya, AU Mon, KX And, HR 2142, and phi Per) are presented. Variable absorption lines, indicative of mass flow, are observed in all systems expect phi Per. Emission lines are seen in KX And and phi Per. Variable high ionization features (NV, SiIV, and CIV) are seen in TX UMa, UCrB, CX Dra, and AU Mon. The observations are modeled using the calculations of Lubow and Shu.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 534-537
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  • 70
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    Line-profile and continuum variations of the contact binary SV Centauri (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: A total of five high and ten low dispersion UV spectra of the interacting contact binary SV Centauri obtained between 1979 and 1982 are analyzed. The low resolution observations cover the whole phase range, while a few selected phases were observed in high dispersion. The UV data were complemented with optical photometric and spectroscopic observations, in order to determine the tructure and absolute dimensions of the system. The profiles of prominent UV resonance and metastable lines undergo drastic changes with phase angle and time. Their overall appearance indicates relatively strong mass loss from the system, exhibiting pronounced variations of the stellar wind. The far UV continuum distribution suggests the presence of a luminous hot radiation source with maximum emission in the soft X-ray range, which is most apparently seen during the first quadrature phase, while it is weakest close to primary minimum. The case exchange and mass loss process as well as the evolutionary stage of SV Centauri are discussed.
    Schlagwort(e): ASTRONOMY
    Materialart: Advan. in Ultraviolet Astron.; p 521-525
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  • 71
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    IUE spectroscopy, visible-band polarimetry, and radiometry of V641 Mon (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: This hot, double line, ellipsoidal variable member of NGC 2264 has been shown previously to be either a semi-detached or contact close binary. Low-resolution IUE spectra are best fitted to a Kurucz model atmosphere for very small (approximately 0.08 mag) E(B-V). The familiar interstellar absorption dip near lambda 2200 is apparently absent. A suitable model atmosphere can be fitted to the IUE fluxes, but flux excesses (compared to the model) appear for all the published U through L magnitudes. The spectrum of the B through L excess appears to follow a .0001 lambda dependence. It is shown that this cannot be interpreted as arising from another star fortuitously observed in the visible band or IR. Ground based polarization measures indicate V641 Mon to be a polarization variable. Previous and new V light curves show the amplitude of light variability itself to be variable by about a factor of 2. It is suggested that all these observed characteristics are best explained by postulating "third light" and identifying part of it with Rayleigh scattered starlight very near to the stars. From this same region there arise circumstellar absorptions which give rise to nontheoretical strengths for Si II and Si III lines.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 513-516
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    IUE observations of the 1981 outburst of nova Cr A (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Low dispersion spectrum observations are analyzed. The light curve of nova Cr A, indicating a moderately fast nova, is presented. Flux calibrated, merged spectrum graphs of April 21, 1981 and September 13, 1981 are presented, demonstrating very strong lines of Al and Si. Additional strong C, Ni, O, and Ne emission lines were identified. Emission lines due to highly ionized species such as Mg VII and Al Vl were observed for short times in May and June 1981. Preliminary analysis of spectra obtained 200 days after maximum indicate that the nebula is still in transition and has not yet reached the nebula state. An over abundance of N and Ne are suggested.
    Schlagwort(e): ASTRONOMY
    Materialart: Advan. in Ultraviolet Astron.; p 478-481
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  • 73
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    Observations and analysis of the R Aquarii jet (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Ultraviolet, optical and radio observations of the symbiotic star R Aquarii are discussed in the light of the discovery of a bright radio and optical jet from this star. The star is probably a binary with a period of 44 years. The VLA maps of the jet reveal a protruding structure extending approximately 10 arc sec from the central radio source with a position angle virtually identical to that of the optical jet observed at Lick. The observations of R Aqr are interpreted as indicating the existence of an accretion disk around an unseen companion. The hot subdwarf has effective temperature approximately 65,000 K. It is suggested that the Mira primary and the hot secondary are in orbit around each other with a high eccentricity. At periastron the hot subdwarf accretes at super critical rates and a jet forms. It is difficult to understand how an accretion disk would have eclipsed the Mira in 1928-1935 and 1974-1980. The suppression of maximum light in these two periods is interpreted as due to a distortion of the Mira envelope at periastron by the tidal interaction with the secondary. The jet may help to explain the excitation of the R Aqr nebula. It is possible that R Aqr flared up as a nova approximately 1000 years ago forming the nebula.
    Schlagwort(e): ASTRONOMY
    Materialart: Advan. in Ultraviolet Astron.; p 452-455
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  • 74
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    The high velocity symbiotic star AG Draconis after its 1980 outburst (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: High and low resolution spectra of AG Dra taken in 1981 are analyzed. The UV spectrum of AG Dra is characterized by prominent high ionization emission lines superimposed on a strong continuum. At high resolution, several intense absorption lines of interstellar origin are seen, in spite of the low interstellar extinction. A similar situation is displayed by the high galactic latitude sd0 stars. The radial velocity difference between the emission lines and the i.s. lines is about -105 Km/sec in agreement with the optical observations. The He II 1640 A line appears much stronger than in other symbiotic stars and suggests the presence of a hot source which is variable according to the activity of the star. The line also exhibits broad emission wings which could be formed in a rotating disk. The NV resonance doublet displays a P Cygni profile and is probably formed in a warm wind. Two components in the UV continuum are identified: a steep component dominating the far UV probably associated with the hot source, and a flatter continuum in the near UV which cannot be accounted for by f-f and f-b emission alone, but which is probably emitted by an optically thick region or disk.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 446-447
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    Ultraviolet spectra of R Coronae Borealis stars (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: An analysis of the International Ultraviolet Explorer spectra of the R CrB-type variables R CrB, RY Sgr, XX Cam, and MV Sgr suggests that: (1) it should be possible to construct useful models for the atmospheres of these hydrogen deficient, carbon rich stars if present standards of metallic line blanketing are used; and (2) the observed wavelength dependence of the circumstellar extinction is primarily due to circumstellar grains.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 429-432
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    The UV emission line spectrum of NGC 6572 (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Ultraviolet spectra of the medium excitation planetary nebula NGC 6572 were obtained with IUE both in the low and in the high resolution mode. These spectra reveal a superposition of emission lines arising in the expanding atmosphere of the central star, evidenced e.g., by their P Cygni profiles, and features arising in the planetary nebula proper. The latter were analyzed in order to determine C, N, O abundances.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 389-392
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    The violet interstellar medium associated with the Carina Nebula (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The interstellar spectrum of HD 93205, an 03V star in the cluster Tr16, located inside the most active part of the Great Carina Nebula was analyzed using data extracted directly from raw IUE images. From the analysis of 67 lines of 25 atoms, ions and molecules, up to six discrete absorption components spanning a maximum velocity range of approximately 375 km 5/1 were identified. The component structure for different species is tabulated and sample absorption lines, indicating at the top the positions of the six components, labelled A to F are shown. Ion column densities appropriate to each component which can be resolved in at least one line were derived by constructing empirical curves of growth and by fitting the observations with corresponding theoretical absorption line profiles. The most important results concerning each component are discussed.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 38-384
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    Small scale structure in the interstellar medium: Orion's threadbare cloak (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The interstellar medium in the central portion of the Orion Cloak dynamical feature was examined for evidence of fine structure. Four stars in the Ori OB I association, HD 37017, 37468, 37479, and 37776 bracket the stars in the lower belt region that were studied previously. Two are members of the sigma Ori subcluster. A lower limit to the scale inhomogeneity can be set using these at 0.1 pc, while on a scale of about 10 pc, the high velocity component of the second spectrum ions shows optical depth variation of more than a factor of 5. Neutral lines do not display the high velocity component. Some preliminary abundances are also given.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 370-373
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    MAGELLAN: High resolution spectroscopy at FUV and EUV wavelengths (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The aim of ESA's MAGELLAN mission is to provide high resolution spectra of celestial sources down to sixteenth magnitude over the extreme ultraviolet wavelength range (between 50 and 140 nm). This range extends from studies of interstellar matter in the disc and halo of this and other galaxies, to stellar envelopes, hot and evolved stars, clusters, intergalactic matter, nuclei of galaxies, quasars, and, finally, planets and satellites. The instrument has a nonconventional optical design using only one reflecting surface; a high groove density concave grating collects the star light, diffracts it and focuses its spectrum into a bidimensional windowless detector operated in a photon counting mode. The slitless configuration provides the spectra of all the sources (point like and extended) in the field of view of the grating. This field of view is limited by a grid collimator to reduce the diffuse background, the stray light and the probability of overlapping spectra in crowded fields.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 347-354
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    Spectral anomalies in low dispersion SWP images (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Physical interpretation of IUE spectra obtained with the SWP camera may be significantly affected by artificial spectral features of several types. In low dispersion large aperture SWP exposures of sources with nominally featureless spectra, a spectral imprint which alters the shape of the continuum, several spurious "emission features" which recur at fixed locations on the camera target, and fixed pattern noise which can result in illusory emission and absorption features were identified. The anomalies appear in spectra extracted from line by line files generated by IUESIPS at all epochs, regardless of the ITF or rectification scheme used for processing.
    Schlagwort(e): ASTRONOMY
    Materialart: Advan. in Ultraviolet Astron.; p 335-338
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  • 81
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    Faint object studies with IUE (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: To push IUE to the limit on faint sources, detector background contributions from the night sky, energetic particle events, detector flaws and calibration errors must be established. Multiple spectra of faint nebular filaments were intercompared with multiple spectra of sky background in a study of the Crab Nebula. Radiation hits dominate the background of any long exposure spectrum but bright spots of the detector can be misconstrued to be radiation hits, or spectral information. The spectra were normalized and then, on a pixel by pixel basis, average and median spectra were constructed. Four data sets (six SWP nebular, six SWP sky, six LWR nebular, and six LWR sky) were processed in parallel. A number of bright and faint background features remain, especially for SWP images. Several features could be misconstrued to be emission from a faint object.
    Schlagwort(e): ASTRONOMY
    Materialart: Advan. in Ultraviolet Astron.; p 331-334
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    Global picture of a Be star (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: An attempt is made to synthesize the observational material on Be stars into a empirical pattern of atmospheric structure. The sequence of atmospheric regions is developed and empirical-numerical estimates of location and structure of the regions are described. Inferences are drawn concerning the general stellar structure required to generate the nonthermal fluxes which produce the observed atmospheric pattern. In particular the atmospheric and subatmospheric origins of mass flux are addressed.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA, Washington B Stars With and Without Emission Lines, Parts 1 and 2; p 409-451
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    On the variability of LSI+61 deg 303 (identical with GT 0236) (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Out of six long and six short wavelength observations, one spectrum exhibits a significant photometric variation: or approximately 20%. Interpreting the continuum as due to superposition of an early B main sequence star plus a gaseous component contributing at lambda 2000 A, the wavelength dependence of the variation suggests that it derives from the latter component. The data indicate that if the observed variation is phase dependent, a minimum should occur between phases 0.8 and 0.2. However, since the variation is observed in only one spectrum, it may well be erratic.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 615-618
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  • 84
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    Empirical atmospheric velocity patterns from combined IUE and visual observations: The Be similar stars (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The velocity pattern which panspectral observations of the Be stars suggest, and an outline of its extension via similar panspectral observations of the Be similar stars are summarized. The time dependent interaction between the stellar mass flux and the local environment produced jointly by the star itself and its original environment are emphasized.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 584-588
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    Mass loss at discrete velocities in Be stars: Evidence for non-radiatively driven wind (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The temporal behavior of the high velocity, relatively narrow absorption components in C IV, Si III, IV observed in the pole-one Be stars psi Ori, 66 Oph, and HR 4009 and what these observations contribute toward our understanding of the Be phenomenon are discussed. Ground based and X-ray data on these stars are compared as well as their UV differences with similarly active Be stars with larger projected rotational velocities.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 575-578
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    continuum and emission lines in eta Lyrae (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Integral photometric characteristics of beta Lyrae were redetermined using its brightest visual companion, the star HD 174664. It was attempted to separate the fluxes coming from the two components. The flux distributions are badly contaminated by the radiation of the circumstellar hydrogen. Peculiarities seem to be present in both components; in particular, the secondary star cannot be represented by an atmosphere with a unique effective temperature, and best represented by a thick disk.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 550-553
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    A recent time of minimum for and atmospheric-eclipse in the ultraviolet spectrum of the Wolf-Rayet eclipsing binary V444 Cygni (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The 1200-1900 angstrom region and fine error sensor observations in the optical for V444 Cyg were continuously observed. More than half of a primary minimum and almost a complete secondary minimum were observed. It is found that the time of minimum for the secondary eclipse is consistent with that for primary eclipse, and the ultraviolet times of minimum are consistent with the optical ones. The spectrum shows a considerable amount of phase dependence. The general shaps and depths of the light curves for the FES signal and the 1565-1900 angstrom continuum are similar to those for the blue continuum. The FES, however, detected an atmospheric eclipse in line absorption at about the phase the NIV absorption was strongest. It is suggested that there is a source of continuum absorption shortward of 1460 angstrom which exists throughout a large part of the extended atmosphere and which, by implication, must redden considerably the ultraviolet continuua of WN stars. A fairly high degree of ionization for the inner part of the WN star a atmosphere is implied.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 542-545
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    A search for cataclysmic binaries containing strongly magnetic white dwarfs (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The AM Herculis type binaries which contain accreting white dwarfs with surface magnetic fields of a few times 10 to the seventh power gauss were studied. If white dwarfs in cataclysmic binaries have a range of field strengths similar to that among single white dwarfs. AM Her like systems should exist with fields as high as 3 x 10 to the eighth power gauss. It is suggested that such objects will not have the strong optical polarization of the AM Her variables; however, they exhibit high harmonic cyclotron emission, making them spectacular UV sources. We made IUE observations of seven candidate cataclysmic variables selected for optical similarity to AM Her binaries. Although all seven objects were detected in the UV, none display unusually strong UV continua. It is suggested that the distribution of magnetic field strengths among single white dwarfs may be different from that among binaries.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 530-533
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  • 89
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    An ultraviolet investigation of the unusual eclipsing binary system FF AQR (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: A series of seven low dispersion IUE exposures in ultraviolet and wavelength regions obtained on December 6, 1981 during the eclipse of the subdwarf, during egress, and out of eclipse is analyzed. These observations and the binary phase at which they were made are shown on a schematic representation of the V-band light curve obtained in 1975. The depth in V is 0.15 mag. The circles are IUE V magnitudes from FES measures obtained during the observing run. They indicate an eclipse depth some 0.05 mag lower than expected, possibly due to difficulties with the color term in the FES calibration. The eclipse depths of Dworetsky in U, B and V were assumed in the calculations.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 577-520
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  • 90
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    Pre-eclipse ultraviolet spectra of Epsilon Aurigae (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Existing high dispersion, long wavelength IUE, high dispersion long and short wavelength, and Balloon borne ultraviolet stellar spectrograph (BUSS) spectra providing a baseline measurement of the ultraviolet spectrum of the Epsilon Aurigae system before eclipse are reviewed. Plans for ultraviolet spectrum IUE observations during the 1982 to 1984 eclipse of Epsilon Aurigae are presented.
    Schlagwort(e): ASTRONOMY
    Materialart: Advan. in Ultraviolet Astron.; p 505-508
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  • 91
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    The ultraviolet variability of T Cr B (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Preliminary results of the ultraviolet variability monitoring of the recurrent nova T Cr B are presented. The star has shown striking changes of the continuum (both shape and integrated luminosity) and of the emission lines since 1979, with a maximum activity in early 1981. In the same period the visual luminosity remained practically constant. The data being studied that the UV variability is due to changes in the physical structure of the accretion disk around the secondary.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 482-485
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  • 92
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    Cataclysmic variables: Disk characteristics from UV observations (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Low dispersion IUE spectra of 3 cataclysmic variables (V442 Oph, V794 Aq1 and H2215-086) are discussed in terms of current disk models. The range of continuum fluxes, line emission and disk parameters of these three novalike systems are compared with past observations of dwarf novae at outburst and quiescence. Evidence of variability on orbital time scales is presented for V442 Oph and H2215-086.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 474-477
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  • 93
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    High velocity gas outflow from the nova-like variable LSI 55 deg -8 (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Low and high dispersion International Ultraviolet Explorer observations and measurements of the optical brightness of LSI 55-8 taken on 5 December, 1981 are analyzed. The presence of the C IV resonance doublet showing a variable P Cygni type of profile with a blue shifted absorption component along with the blue shifted absorption features of the high temperature ions indicate the existence of outflowing hot plasma (i.e., a wind). An upper limit of the mass outflow rate was established from the shot wavelength edge of the C IV absorption. The normalized C IV profile is shown o be variable with the largest changes occurring in the relative strength and shape of the emission component. These changes appear to be systematic, and may be associated with the changing projection of the outflowing hot plasma against the disk as a function of orbital motion. LSI 55-8 demonstrates most of the spectral and photometric characteristics exhibited by the nova like, UX UMa type variables, as well as with the dwarf novae in outburst or standstill. The high accretion rate inferred from fitting the Williams theoretical disk model fluxes to IUE data support the hypothesis that LSI 55-8 and related nova like systems are in a state of prolonged outburst.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 465-469
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  • 94
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    IUE observations of dust albedo in nebulae (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The wavelength dependence of the effective albedo of the dust at several positions near the Hourglass region of M8 was determined. Accurate estimates of the contribution of the continuous gas emission can be made using the region 1400A to 1600A. The main uncertainty results from the peculiar extinction of the exciting star, Herschel 36, and the possibility that extinction between the star and the reflecting portions of the nebula exists and needs to be corrected for. The albedo for some planetaries such as NGC 6543 were also investigated. The main uncertainty here is estimating instrumental contributions to the scattering in observing these small objects.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 405-408
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  • 95
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    IUE observations of planetary nebulae and their central stars in the Magellanic Clouds (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The planetary nebulae LMC P40, SMC N2, and SMC N5 and their central stars were observed with IUE. The C abundances in the nebulae, compared with those in galactic planetaries, indicate that convective dredgeup of locally nucleosynthesized C has occurred. The progenitors of the nebulae were C stars at the theoretical upper luminosity threshold, thus such stars do occur as predicted, although none so bright have been found in the Clouds. The central stars of the nebulae have masses approximately 1 solar mass, luminosities approximately 40,000 solar luminosity, and radii approximately 0.7 solar radius; they have probably not yet reached their maximum luminosities. With M(subv) 19.1-19.8, they may be the visually faintest stars yet observed by UV spectroscopy. Clearly, it is not true that planetary nebulae nuclei all have masses M = (0.6 + or - 0.1) solar mass.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 397-400
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  • 96
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    High dispersion observations of selected regions in the Orion Nebula (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: High resolution spectral observations were made of several regions of the Orion Nebula near theta (2) Ori A using the IUE. The positions were selected using a moderate spatial resolution map from a previous low dispersion IUE survery of this section of the nebula. With the SWP and LWR cameras, 28 pectra were obtained of the bright bar, three Taylor-Munch cloudlets, and several surrounding locations. Emission lines of He, C, N, O, Mg, and Si allow a characterization of these cloudlets and of the gas in and around the bar. Small aperture observations provide radial velocity information for the ultraviolet emission of these features. These data show ionization variations from region to region and are suggestive of stellar wind interactions between the cloudlets and theta(2) Ori A.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 374-379
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  • 97
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    Highly ionized gas in the galactic halo (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The major results are summarized of a study of interstellar absorption in the halo which makes use primarily of IUE observations of a sample of 24 OB stars at z distances between 0.5 and approximately 3 kpc. These data, which cover a wide range of directions, are analysed together with other available results in order to investigate the distribution and physical conditions of highly ionized gas in the halo.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 363-368
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  • 98
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    The photometric performance of the IUE (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The scientific objectives and performance characteristics of a new astronomy mission referred to as the far ultraviolet spectroscopic explorer, or FUSE are being defined by team involving people experienced in instrumentation, observations, and theory in order to develop. mission and instrumental requirements that best meet the scientific needs. The team is intended to have a lifetime of about one year, ending with the submission of a report to NASA which could be used as the basis for an engineering design study. The principal objective of FUSE is to obtain astronomical spectra at wavelengths shorter than is possible with the Space Telescope.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 339-342
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  • 99
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    Bibliographical index of objects observed by IUE (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Six astronomical journals were searched and 343 papers describing studies using data obtained with the International Ultraviolet Explorer satellite were identified. From a review of these papers, the names of the astronomical objects discussed were recorded and compiled into a list of 2460 entries, along with each reference, and sorted by object name or catalogue number. This index enables a user to tell immediately where to find published papers describing IUE observation of the objects of interest to him.
    Schlagwort(e): ASTRONOMY
    Materialart: Advan. in Ultraviolet Astron.; p 322-325
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  • 100
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    The IUE echelle blaze function (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: An improved form for the echelle blaze function derived by Ake (1981) was used to study the apparent variation of grating constant K with order m for the long and short wavelength spectrographs. For the LWR camera, early images indicate that K should vary linearly with order. It is suggested that this represents a rotation of the observed blaze centers on the camera compared to a constant K=m lambda line. In four years of use, changes in sensitivity across the camera changed the observed blaze function, inducing a curvature in the K versus m relation. This curvature varies in time with variations in camera response. The SWP camera shows these effects to a lesser degree.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 318-321
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