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2 results

  • Ionization effects in stellar winds of massive X-ray binaries

  • G. Hammerschlag-Hensberge
  • Journal:
    International Astronomical Union Colloquium / Volume 59 / 1981
    Published online by Cambridge University Press:
    12 April 2016, pp. 457-460
    Print publication:
    1981
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  • High resolution ultraviolet spectroscopy of the early-type X-ray binary Vela X-l/HD 77581 provides a unique example to study the ionization structure of the stellar wind which varies under influence of the X-ray source. New results for other early-type X-ray binaries will be presented and compared with the Vela X-1 model. These results show that the observed variations strongly depend on the intensity of the X-ray source and on the density structure of the stellar wind.

  • Mass loss effects in the spectrum of the O 6.5f binary HD 153919

  • G. Hammerschlag-Hensberge
  • Journal:
    Symposium - International Astronomical Union / Volume 83 / 1979
    Published online by Cambridge University Press:
    14 August 2015, pp. 31-34
    Print publication:
    1979
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  • Apart from the known P-Cygni profiles of Hβ, HeI 5876, 4471 in the spectrum of HD 153919, also HeII 3923 and a line at 3759 A which is tentatively identified as OIII show an emission component. These lines indicate that the Of star is losing mass at a high rate. A detailed analysis of the radial velocities obtained from 76 spectrograms indicates that the outflow of the wind is not spherically symmetric: at the side where the Of star faces its companion the velocity of the wind has increased.