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  • 1
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    On the possibility of a geocoronal contribution to the celestial soft X-ray background (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The possibility is investigated that a significant fraction of the X-ray background in the energy range from 0.2 to 0.28 keV originates in the geocorona through bremsstrahlung. It is concluded that the geocoronal flux must be substantial at some times and the possibility exists that an observable geocoronal background exists at all times. The existing data on the soft X-ray background is found to be compatible with the hypothesis of a geocoronal component.
    Keywords: SPACE RADIATION
    Type: Astrophysics and Space Science; 30; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Future ultraviolet observations from space (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Astronomical facilities to observe from space in the ultraviolet are reviewed. For the immediate future, IUE and the extreme ultraviolet spectrometers of Voyager 1 and Voyager 2 are available for furthering knowledge of cataclysmic variables. The Hubble Space telescope is scheduled for launch in 1986 and will be available to guest observers. The Far Ultraviolet Spectroscopic Explorer, which is expected to provide the capability to observe in the far and extreme ultraviolet, is planned for launch in the 1990s.
    Keywords: SPACE RADIATION
    Type: ESA Recent Results on Cataclysmic Variables; p 193-194
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    NASA TECHNICAL REPORTS
  • 3
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    A search for Lyman-alpha emission in beta Lyrae from Copernicus (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: High-resolution (0.2 A) spectrophotometric observations of the complex eclipsing binary beta Lyrae were obtained with the Princeton Telescope Spectrometer on the Copernicus satellite. We discuss the search for L-alpha emission in beta Lyrae and compare the Copernicus results with the OAO-2 observations of the same binary system. The possible L-alpha emission features observed from OAO-2 are identified as blends of the emission lines of other elements in the vicinity of L-alpha.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; 188; Mar. 1
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    NASA TECHNICAL REPORTS
  • 4
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    On the physical parameters for Centaurus X-3 and Hercules X-1. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: It is shown how upper and lower limits on the physical parameters of X-ray sources in Centaurus X-3 and Hercules X-1 may be determined from a reasonably simple and straightforward consideration. The basic assumption is that component A (the non-X-ray emitting component) is not a star collapsing toward its Schwartzschild radius (i.e., a black hole). This assumption appears reasonable since component A (the radius of the central occulting star) appears to physically occult component X. If component A is a 'normal' star, both observation and theory indicate that its mass is not greater than about 60 solar masses. The possibility in which component X is either a neutron star or a white dwarf is considered.
    Keywords: SPACE RADIATION
    Type: Astrophysics and Space Science; 19; Dec. 197
    Format: text
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    NASA TECHNICAL REPORTS
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