Simultaneous ultraviolet, optical and X-ray observations of the X-raysource Vel X-1 (HD 77581).
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 1980
- DOI:
- 10.1086/158062
- Bibcode:
- 1980ApJ...238..969D
- Keywords:
-
- Eclipsing Binary Stars;
- Stellar Spectra;
- Ultraviolet Astronomy;
- Ultraviolet Spectra;
- X Ray Sources;
- Interstellar Matter;
- Iue;
- Line Spectra;
- Stellar Mass;
- Stellar Spectrophotometry;
- Astrophysics