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  • Cell & Developmental Biology  (1,486)
  • ASTRONOMY  (1,188)
  • 1975-1979  (2,674)
Collection
Keywords
Publisher
Years
Year
  • 11
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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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    NASA TECHNICAL REPORTS
  • 12
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    Future activity in astrophysics (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: An overview is given of the NASA astrophysics program with emphasis on missions which are likely to be started or flown within the next five to seven years. Included in this summary are descriptions of approved future missions such as the Infrared Astronomical Satellite, the Space Telescope and the HEAO-B and HEAO-C satellites, as well as of missions which are now in the planning stage. Such missions include the Cosmic Background and Extreme Ultraviolet Explorers, the Gamma Ray and Cosmic Ray Observatories, the Advanced X-ray Astrophysics Facility, infrared and optical/ultraviolet telescopes to be used on the Space Shuttle, and the orbiting gyroscope experiment (GP-B). The current state-of-the-art, as well as future requirements in astrophysical sensing techniques, are highlighted.
    Keywords: ASTRONOMY
    Type: EASCON ''78; Electronics and Aerospace Systems Convention; Sep 25, 1978 - Sep 27, 1978; Arlington, VA
    Format: text
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    NASA TECHNICAL REPORTS
  • 13
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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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    NASA TECHNICAL REPORTS
  • 14
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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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    NASA TECHNICAL REPORTS
  • 15
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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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    NASA TECHNICAL REPORTS
  • 16
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    Infrared instrumentation on NASA airborne observatories (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Two airborne observatories operated above much of the earth's atmosphere are providing effective platforms for infrared astronomical observations. A summary is given of the wide variety of instrumentation currently in use and continuing to be developed for these facilities. The classes of instruments include various far infrared photometers, filter wheel and grating spectrometers, Fourier transform spectrometers, Michelson and Fabry-Perot interferometers, a polarimeter, and a microwave line receiver.
    Keywords: ASTRONOMY
    Type: Optical Engineering; 16; Nov
    Format: text
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    NASA TECHNICAL REPORTS
  • 17
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    Extragalactic astronomy: The universe beyond our galaxy (1976)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: This single-topic brochure is for high school physical science teachers to use in introducing students to extragalactic astronomy. The material is presented in three parts: the fundamental content of extragalactic astronomy; modern discoveries delineated in greater detail; and a summary of the earlier discussions within the structure of the Big-Bang Theory of evolution. Each of the three sections is followed by student exercises (activities, laboratory projects, and questions-and-answers). The unit close with a glossary which explains unfamilar terms used in the text and a collection of teacher aids (literature references and audiovisual materials for utilization in further study).
    Keywords: ASTRONOMY
    Type: NASA-EP-129
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 18
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    Spectral types for early-type stars observed by Skylab (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: MK spectral types are presented for 246 early-type stars observed with the S-019 ultraviolet stellar astronomy experiment on Skylab. K-line types are also given where applicable, and various peculiar stars are identified. The peculiar stars include five silicon stars, a shell star, a helium-rich star, a silicon-strontium star, a chromium-europium star, and two marginal metallic-line stars.
    Keywords: ASTRONOMY
    Type: Astronomical Journal; 83; Feb. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 19
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    Unusual satellite data: A black hole? (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Data obtained by the NASA-launched European Space Agency's International Ultraviolet Explorer satellite suggests the possibility of a massive black hole at the center of some globular clusters (star groups) in our galaxy. Six of these clusters, three of them X-ray sources, were closely examined. Onboard short wavelength UV instrumentation penetrated the background denseness of the clusters 15,000 light years away where radiation, probably from a group of 10 to 20 bright blue stars orbiting the core, was observed. The stars may well be orbiting a massive black hole the size of 1,000 solar systems. The existence of the black hole is uncertain. The dynamics of the stars must be studied first to determine how they rotate in relation to the center of the million-star cluster. This may better indicate what provides the necessary gravitational pull that holds them in orbit.
    Keywords: ASTRONOMY
    Type: NASA-NEWS-RELEASE-78-122 , P78-10124
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 20
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    Pulkovo Observatory: An essay on its history and scientific activity (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A history of the observatory and of the development of astronomy in Russia during the past 150 years is presented. Scientific activity was traced from the earliest objectives of precise stellar coordinates to the problems of radio variabilities of quasars.
    Keywords: ASTRONOMY
    Type: NASA-TM-75083
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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