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  • ASTRONOMY  (63)
  • 1990-1994
  • 1975-1979  (63)
  • 1979  (63)
  • 1
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    The MIT/OSO 7 catalog of X-ray sources - Intensities, spectra, and long-term variability (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: This paper is a summary of the observations of the cosmic X-ray sky performed by the MIT 1-40-keV X-ray detectors on OSO 7 between October 1971 and May 1973. Specifically, mean intensities or upper limits of all third Uhuru or OSO 7 cataloged sources (185 sources) in the 3-10-keV range are computed. For those sources for which a statistically significant (greater than 20) intensity was found in the 3-10-keV band (138 sources), further intensity determinations were made in the 1-15-keV, 1-6-keV, and 15-40-keV energy bands. Graphs and other simple techniques are provided to aid the user in converting the observed counting rates to convenient units and in determining spectral parameters. Long-term light curves (counting rates in one or more energy bands as a function of time) are plotted for 86 of the brighter sources.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal Supplement Series; 39; Apr. 197
    Format: text
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  • 2
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    M2 ocean tide parameters and the deceleration of the moon's mean longitude from satellite orbit data (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: An estimation is made of the principal long-period spherical harmonic parameters in the representation of the M2 ocean tide from the orbital histories of the three satellites 1967-92A, Starlette, and GEOS 3. The data used are primarily the evolution of the orbital inclinations of the satellites in conjunction with the longitude of the ascending node from GEOS 3. Analysis procedure and analytic formulation, as well as ocean tidal parameter estimation and deceleration of the lunar mean longitude are outlined. The credibility of the M2 ocean tide solution is further enhanced by the close accord between the computed value for the deceleration of the lunar mean longitude and other recently reported estimates. It is evident from the results presented that studies of close earth satellite orbits are able to provide important information about the tidal forces acting on the earth.
    Keywords: ASTRONOMY
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  • 3
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    An observational study of the AFGL infrared sky survey. IV - Further results from the revised catalog (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 227
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  • 4
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    Evidence for a variable far-infrared source in NGC 6334 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: NGC 6334 has been mapped with a 40-250 micron photometer with 1 arcmin resolution. Six sources of far-infrared radiation have been detected. The second-strongest source was not detected in an earlier (2.7 years) 40-350 micron survey of the same region. This source is interpreted as a variable far-infrared source. The new source, located at the position of OH and H2O maser sources, is extended (0.7 arcmin FWHM) and has a bolometric luminosity of 190,000 solar luminosities and may represent a hitherto unobserved transient stage of protostellar collapse.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 232
    Format: text
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  • 5
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    A comparison of high resolution radio and far-infrared maps of M 17 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: New 3.5-cm radio and 69-micron far-infrared maps of M17, both made with an angular resolution of about 1.5 arcmin, are presented. Each map has three distinct maxima. Two of the maxima on the far-IR map agree in position with the corresponding maxima on the radio map. However, the positions of the brightest peak in the radio and far-infrared maps, located in the SW part of M17, differ by 4.6 + or - 2.2 s in right ascension and +44 + or - 20 sec in declination, with the far-infrared peak lying between the radio peak and the dense molecular cloud southwest of the H II region. It is believed that the positional offset of the radio and far-infrared peak is physically significant. The origin of the far-infrared radiation appears to be thermal emission from dust at the interface of the ionized gas and molecular cloud. This interface region is probably heated by radiation from the H II region.
    Keywords: ASTRONOMY
    Type: Astronomy and Astrophysics; 76; 1, Ju; June 197
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  • 6
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    The detection of an optical burst coincident with an X-ray burst from MXB 1837 + 05 /Ser X-1/ (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The detection of a simultaneous optical and X-ray burst from MXB 1837 + 05 (4U 1837 + 04 = Ser X-1) is reported. A similar detection was made earlier from MXB 1735-44. These are the only two burst sources that have been optically observed (simultaneous with X-ray observations) at a high level of sensitivity. Therefore, it may well be that optical bursts commonly accompany X-ray bursts. The relative timing and flux ratio of the optical and X-ray bursts imply that the optical radiation is probably reemission from X-ray-heated matter within 1-2 light seconds of the X-ray source and no more than a few light seconds in extent. This matter may be in an accretion disk around the X-ray source or possibly in the atmosphere of a dwarf companion.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 233
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  • 7
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    Simultaneous ultraviolet and X-ray observations of the massive binary V861 Scorpii /=OAO 1653-40/ (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Results are reported for simultaneous Copernicus UV and X-ray observations of the massive binary system V861 Sco (possibly associated with the X-ray source OAO 1653-40) over a period of five orbital cycles from April to September 1978. It is found that the UV spectrum of V861 Sco is similar to that of a normal supergiant and that the X-ray flux from OAO 1653-40 is highly variable. A simultaneous change in the C III 1176-A line and the 3.8-8.8-keV X-ray flux is discussed which was detected when V861 Sco was observed in September 1978. The close correlation between the X-ray and UV events is taken to imply that the X-ray source OAO 1653-40 is coincident with V861 Sco. The event energetics and physical conditions in the region responsible for the C III 1176-A emission are considered. It is concluded that the most likely X-ray production mechanism is accretion by a gas stream onto a black hole.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 233
    Format: text
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  • 8
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    Detector arrays for photometric measurements at soft X-ray, ultraviolet and visible wavelengths (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The construction and modes of operation of the Multi-Anode Microchannel Array (MAMA) detectors are described, and the designs of spectrometers utilizing them are outlined. MAMA consists of a curved microchannel array plate, an opaque photocathode (peak quantum efficiency of 19% at 1216 A), and a multi-anode (either discrete- or coincidence-anode) readout array. Designed for use in instruments on spaceborne telescopes, MAMA can be operated in a windowless configuration in extreme-ultraviolet and soft X-ray wavelengths, or in a sealed configuration at UV and visible wavelengths. Advantages of MAMA include low applied potential (less than 3.0 kV), high gain (greater than 10 to the 6th electrons/pulse), low sensitivity to high-energy charged particles, and immunity to external magnetic fields of less than 500 Gauss
    Keywords: ASTRONOMY
    Type: Space optics; May 22, 1979 - May 24, 1979; Huntsville, AL
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  • 9
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    A0535+26 - Refined position measurement and new pulse period data (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The hard, pulsing, transient X-ray source A0535+26 has been observed with SAS 3 on three occasions during 1977-1978. These observations have yielded a precise position measurement (20 arcsec error radius), which renders the identification of A0535+26 with the Be star HDE 245770 virtually certain. The pulse phase was tracked for about 9 days in April 1978 and clearly showed both first and second derivatives in the pulse period. An analysis of these timing data, combined with data from previous observations, leads to the following conclusions: (1) a significant fraction of the observed changes in pulse period is probably intrinsic to the compact X-ray star (e.g., accretion torques on a neutron star), and (2) conservative limits on binary orbital parameters tend to further confirm a long orbital period (at least about 20 days).
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 228
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  • 10
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    Two-micron spectrophotometry of the galaxy NGC 253 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A very strong Brackett-gamma hydrogen emission line and the 2.3-micron CO stellar absorption feature have been measured in NGC 253. The presence and strength of the CO feature indicate that late-type giant stars produce most of the 2.2-micron continuum emission, while the rate of ionization implied by strength of the Brackett-gamma line indicates that much, perhaps all, of the luminosity detected at far-infrared wavelengths originates from a large number of OB stars. As compared with the corresponding region of the Galaxy, the number of massive young stars in the central 200 pc of NGC 253 is 30 times greater, but the total mass of stars is roughly the same.
    Keywords: ASTRONOMY
    Type: Royal Astronomical Society; vol. 189
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