Simultaneous ultraviolet, optical, and X-ray observations of the X-ray source VELA X-1 /HD 77581/

Details Simultaneous ultraviolet, optical, and X-ray observations of the X-ray source VELA X-1 /HD 77581/ Simultaneous ultraviolet, optical, and X-ray observations of the X-ray source VELA X-1 /HD 77581/

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238..969d&link_type=abstract

Astrophysical Journal, Part 1, vol. 238, June 15, 1980, p. 969-981.

Astronomy and Astrophysics

Astronomy

77

Eclipsing Binary Stars, Stellar Spectra, Ultraviolet Astronomy, Ultraviolet Spectra, X Ray Sources, Interstellar Matter, Iue, Line Spectra, Stellar Mass, Stellar Spectrophotometry

Scientific paper

UV spectra (obtained by the IUE) of HD 77581, associated with the binary X-ray source Vela X-1, show a spectrum typical of an early B-type supergiant. However, the P Cygni profiles of strong resonance lines show substantial variations with orbital phase. These variations can be ascribed to the changing ionization state in the stellar wind caused by the X-ray emitting companion. X-ray and spectroscopic and photometric optical observations, simultaneous with the IUE observations, indicate behavior consistent with previous epochs.

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