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  • ASTRONOMY  (270)
  • 1975-1979  (270)
  • 1979  (270)
  • 1
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    Astronomy satellite obtains first X-ray burst picture (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Keywords: ASTRONOMY
    Type: NASA-NEWS-RELEASE-79-65 , P79-10051
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Americans and Canadians to study February 26 eclipse (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Keywords: ASTRONOMY
    Type: NASA-NEWS-RELEASE-79-18 , P79-10018
    Format: application/pdf
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  • 3
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    X-ray observatory reveals extremely distant quasars (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Keywords: ASTRONOMY
    Type: NASA-NEWS-RELEASE-79-36 , P79-10036
    Format: application/pdf
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  • 4
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    International Ultraviolet Explorer (IUE) Post Launch Report 2 (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The International Ultraviolet Explorer (IUE), an Explorer class ultraviolet astronomy mission, is an international cooperative program between the United States, the United Kingdom (UK), and the European Space Agency (ESA) which provides for a single launch into geosynchronous orbit to conduct spectral distribution studies of celestial and solar system ultraviolet sources. The spacecraft and scientific instruments were designed and fabricated at the Goddard Space Flight Center. The spectrograph camera was provided by the UK; ESA provided the solar array as well as the European ground station. The IUE observatory system was designed to functionally resemble a ground-based optical observatory at which guest observers could execute observing programs in real time. Observatory performance substantially exceeded design and mission objectives. The secondary mission objectives were also met.
    Keywords: ASTRONOMY
    Type: NASA-TM-80471 , S-868-78-03 , REPT-2
    Format: application/pdf
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  • 5
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    A flaring X-ray pulsar in Dorado (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A study of unusual gamma-ray bursts detected on March 5 and March 6, 1979 in the KONUS experiment on the Venera 11 and Venera 12 spacecraft shows their source to be flaring X-ray pulsar in Dorado.
    Keywords: ASTRONOMY
    Type: NASA-TM-75658 , REPT-617
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  • 6
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    UBVR observation of V1357 Cyg = Cyg X-1. Search of the optical radiation of the accretion disk (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Data from 30 nights of V 1357 Cyg observations in July, August, and September of 1977 are presented. The contribution of the disk to the optic brightness of the system is computed with regard for the heating of its surface by ultraviolet radiation from V 1357 Cyg and X-ray radiation from Cyg X-1. The disk radiation explains the irregular variability in the system brightness. The possibility of the eclipse of the star by the disk and the disk by the star is discussed.
    Keywords: ASTRONOMY
    Type: NASA-TM-75677 , PR-408
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  • 7
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    Southern RS CVn systems - Candidate list (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: A list of 43 candidate RS CVn binary systems in the far southern hemisphere of the sky (south of -40 deg declination) is presented. The candidate systems were selected from the first two volumes of the Michigan Spectral Catalog (1975, 1978), which provides MK classifications for southern HD stars and identifies any unusual characteristics noted for individual stellar spectra. The selection criteria used were: (1) the occurrence of Ca II H and K emission; (2) known or suspected binary nature; (3) regular light variations of zero to one magnitude; and (4) spectral type between F0 and K2 and luminosity less than bright giant (II).
    Keywords: ASTRONOMY
    Type: Astronomical Journal; 84; Sept
    Format: text
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  • 8
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    Tropospheric limitations on the accuracy of phase measurement of coordinates in astronomy (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The effect of tropospheric fluctuation on the accuracy of phase measurements of coordinates is discussed. The nature of the averaging of the tropospheric effects, if N coordinate measurements of duration T with period mu are made, is investigated. Various averaging modes depending on the relation of the various time parameters are investigated. Equations taking into account the correlations between individual observations are presented. It is shown that the correlation interval between the individual observations is always greater than the fluctuation period of tropospheric inhomogeneities typical for a given baseline.
    Keywords: ASTRONOMY
    Type: NASA-TM-75480
    Format: application/pdf
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  • 9
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    Heliostat for astronomical usage (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The design of a heliostat is presented. The invention consists of a mechanical polar axis which can rotate and which is parallel to the world axis. A mirror is supported in such a way that it can be rotated arbitrarily around a declination axis which is perpendicular to it. After execution of this rotation, the mirror can be clamped in the plane of the world axis, which can be corrected and verified by special collimation directions. The clockwork or drive unit can be driven for a 24 or 48 hour complete rotation of the axis using any known device such as switchable gears, without changing its regular variation related to stellar time or mean solar time.
    Keywords: ASTRONOMY
    Type: NASA-TM-75481
    Format: application/pdf
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  • 10
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    On the origin of a very close similarity between the spectra of the supernova type 1 in NGC 3198 and the absorption of DQ HeR (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The type 1 supernova discovered late in 1966 in NGC 3198 has broad minima in its spectrum break down into a number of significantly narrower absorption bands. The broad minima of tau, sigma and mu, which usually show no details in the spectra of type supernovas, contain a number of narrow absorption bands. The reality of most of these absorption bands is demonstrated by comparison of recordings of spectra of the supernova presented for two moments in time. These minima (particularly of tau and mu,) are a result of blending of several broad absorption bands. The minimum of tau should be a blend of intensive and very broad Fe absorption lines, in which the lower level is metastable. The wavelengths of these line are: 5169, 5198, 5235, 5276, 5317, 5363A.
    Keywords: ASTRONOMY
    Type: NASA-TM-75421
    Format: application/pdf
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