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  • ASTRONOMY  (47)
  • 2015-2019
  • 1975-1979  (47)
  • 1950-1954
  • 1930-1934
  • 1925-1929
  • 1976  (47)
  • 1
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    Optical observation of WRA 977 (3U 1233-62?) (1976)
    In:  CASI
    Details
    Publication Date: 2006-04-18
    Description: UBV photometry of WRA 977 on 36 nights between January and July of 1974 shows that this object is active on a time scale of days at the 0.1 mag level, but that it remains quite constant during monitoring intervals lasting up to 1 hour. Periodogram analysis reveals no significant periodic variation in the brightness of this object.
    Keywords: ASTRONOMY
    Type: NASA. Goddard Space Flight Center X-ray Binaries; p 677-682
    Format: text
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  • 2
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    A study of meteor spectroscopy and physics from earth-orbit: A preliminary survey into ultraviolet meteor spectra (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Preliminary data required to extrapolate available meteor physics information (obtained in the photographic, visual and near ultraviolet spectral regions) into the middle and far ultraviolet are presented. Wavelength tables, telluric attenuation factors, meteor rates, and telluric airglow data are summarized in the context of near-earth observation vehicle parameters using moderate to low spectral resolution instrumentation. Considerable attenuation is given to the problem of meteor excitation temperatures since these are required to predict the strength of UV features. Relative line intensities are computed for an assumed chondritic composition. Features of greatest predicted intensities, the major problems in meteor physics, detectability of UV meteor events, complications of spacecraft motion, and UV instrumentation options are summarized.
    Keywords: ASTRONOMY
    Type: NASA-CR-2664
    Format: application/pdf
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  • 3
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    An Atlas of extraterrestrial particles collected with NASA U-2 aircraft, 1974 - 1976 (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Extraterrestrial particles collected during U-2 flights in the stratosphere were divided into four groups: chondritic, iron-sulfur--nickel, mafic silicates, and others. The chondritic aggregates are typically composed of Fe, Mg, Si, C, S, Ca, and Ni. Detectable levels of He-4 implanted from the solar wind occur in some. Olivine, spinel, and possibly pyrrhotite and a hydrated layered-lattice silicate were identified. The chondritic ablation particles contain no sulfur and appear to have been melted. Magnetite, olivine, and pyroxene were identified. The iron-sulfur-nickel type particles resemble meteoritic iron sulfide with a small amount of nickel, and contain magnetite and troilite. The mafic silicate type particles are iron magnesium silicate grains with clumps of chondritic aggregate particles adhering to their surfaces. Olivine and possibly pyrrhotite and pyroxene were identified. Most of the iron-nickel type particles are spherules and include taenite and wustite. The other type particles include nickel-iron mounds on spheroidal glassy-like grains having chondritic-like elemental abundances.
    Keywords: ASTRONOMY
    Type: NASA-TM-X-73152 , A-6672
    Format: application/pdf
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  • 4
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    The ultraviolet variations of Iota Cassiopeiae (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; 209; Oct. 1
    Format: text
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  • 5
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    Interplanetary scintillation observations with the Cocoa Cross radio telescope (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Physical and electrical parameters for the 34.3-MHz Cocoa Cross radio telescope are given. The telescope is dedicated to the determination of solar-wind characteristics in and out of the ecliptic plane through measurement of electron-density irregularity structure as determined from IPS (interplanetary scintillation) of natural radio sources. The collecting area (72,000 sq m), angular resolution (0.4 deg EW by 0.6 deg NS), and spatial extent (1.3 km EW by 0.8 km NS) make the telescope well suited for measurements of IPS index and frequency scale for hundreds of weak radio sources without serious confusion effects.
    Keywords: ASTRONOMY
    Type: Journal of Geophysical Research; 81; Feb. 1
    Format: text
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  • 6
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    MX 1313+29 - A compact source of very low energy X-rays in Coma Berenices (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A compact X-ray source near the North Galactic Pole has been detected with the low-energy X-ray telescope aboard the SAS-3 satellite. The spectral temperature of the source is less than 1 million K, and the energy flux at the earth is 3 by 10 to the -10th power erg/sq cm/sec above 0.1 keV. The flux appeared to be constant both on short time scales (10-1000 s), and over the interval from the first SAS-3 observation (June 12, 1975) to the latest (July 15, 1975). The possible identification of this source with the hot white dwarf HZ 43 is discussed.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; 203; Jan. 1
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  • 7
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    The ultraviolet variations of iota Cas (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Ap variable star iota Cas was observed with the photometers on OAO-2 covering the spectral range 1430-4250 A. The ultraviolet light curves show a double wave with primary minimum and maximum at phase ? 0.00 and 0.35, respectively. Secondary minimum light is at phase ? 0.65 with secondary maximum at phase ? 0.85. The light curves longward of 3150 A vary in opposition to those shortward of this 'null region'. Ground-based coude spectra show that the Fe II and Cr II line strengths have a double-wave variation such that maximum strength occurs at minimum ultraviolet light. We suggest that the strong ultraviolet opacities due to photoionization and line blanketing by these metals may cause the observed photometric variations. We have also constructed an oblique-rotator model which shows iron and chromium lying in a great circle band rather than in circular spots.
    Keywords: ASTRONOMY
    Type: Colloquium on Physics of Ap-stars; Sep 08, 1975 - Sep 11, 1975; Vienna; Austria
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  • 8
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    Catalogue of diffuse interstellar band measurements (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Diffuse-band data have been collected from the literature and reduced statistically to a common measurement system, enabling correlation analyses to be made with a larger quantity of data than previously possible. A full listing of the catalogued data is presented, along with some discussion of the correlations. One important application of such studies is the identification of cases of peculiar diffuse-band behavior, and a table is given showing all cases of band strengths deviating by more than twice the mean dispersion from the best-fit correlations. This table may be useful in planning further observations.
    Keywords: ASTRONOMY
    Type: Astronomical Journal; 82; Feb. 197
    Format: text
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  • 9
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    Coordinated X-ray optical and radio observations of YZ Canis Minoris (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Coordinated X ray, optical, and radio observations of the flare star YZ CMi are reported. Twenty-two minor optical flares and twelve radio events were recorded. No major optical flares, greater than 3 magnitudes, were observed. Although no flare related X ray emission was observed, the measured upper limits in this band enable meaningful comparisons with published flare star models. Three of the five models predicting the relative X ray to optical or radio flare luminosities are in serious disagreement with the observations. For the largest optical flare with coincident X ray coverage, the 3 sigma upper limit on X ray emission in the 0.15 to 0.8 keV band is 8.7 x 10 to the 28th power erg/s, corresponding to a ratio of X ray to B-band luminosity of less than 0.3. Based on the present results, the contribution of the flares UV Ceti flare stars to the galactic component of the diffuse soft X ray background is less than 0.2 percent.
    Keywords: ASTRONOMY
    Type: NASA-TM-X-71256 , X-682-76-287
    Format: application/pdf
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  • 10
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    Recent developments at JPL in the application of digital image processing techniques to astronomical images (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Several techniques of a digital image-processing nature are illustrated which have proved useful in visual analysis of astronomical pictorial data. Processed digital scans of photographic plates of Stephans Quintet and NGC 4151 are used as examples to show how faint nebulosity is enhanced by high-pass filtering, how foreground stars are suppressed by linear interpolation, and how relative color differences between two images recorded on plates with different spectral sensitivities can be revealed by generating ratio images. Analyses are outlined which are intended to compensate partially for the blurring effects of the atmosphere on images of Stephans Quintet and to obtain more detailed information about Saturn's ring structure from low- and high-resolution scans of the planet and its ring system. The employment of a correlation picture to determine the tilt angle of an average spectral line in a low-quality spectrum is demonstrated for a section of the spectrum of Uranus.
    Keywords: ASTRONOMY
    Type: Seminar on Image processing; Feb 24, 1976 - Feb 26, 1976; Pacific Grove, CA
    Format: text
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