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  • SPACE SCIENCES  (2)
  • 1970-1974  (2)
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  • SPACE SCIENCES  (2)
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  • 1
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    Unknown
    The absolute magnitudes and spectral types of the stars in the gamma Velorum system. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The ratio of the visual luminosities of the O and WC components of the binary system gamma (2) Vel has been derived by comparison of the emission-line strengths in the spectrum with those in the spectrum of a single WC8 star, HD 192103. The result is 1.4 mag, with the O star being brighter; the classification of the O star was found to be 09 I, so that the classification of gamma (2) Vel is WC8+09 I.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 172; Mar. 15
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Spectroscopic observations of the Cygnus X-1 optical candidate. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Data from nine high-dispersion spectra of HDE 226868, the optical candidate for Cyg X-1, are presented. The line profiles at He II (4686 A) show marked changes from night to night. Our data are not compatible with models where the emission line arises from the unseen secondary component of the system, as has been suggested by other observers. We propose that the emission originates in a gas stream falling toward the secondary; this provides observational evidence that the X-ray source is powered by accretion. We also see changes in spectral type and luminosity class with phase, further complicating attempts to make mass estimates for the system.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 179; Feb. 1
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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