Evidence for variations in the phase-dependent ionization structure of the stellar wind in VELA X-1

Details Evidence for variations in the phase-dependent ionization structure of the stellar wind in VELA X-1 Evidence for variations in the phase-dependent ionization structure of the stellar wind in VELA X-1

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.218..443v&link_type=abstract

In ESA 4th European IUE Conf. p 443-447 (SEE N84-35135 24-88)

Physics

Binary Stars, Pulsars, Stellar Winds, Supergiant Stars, X Ray Sources, Exosat Satellite, Iue, Stellar Spectra, Ultraviolet Spectroscopy

Scientific paper

Results are reported of high-resolution IUE observations of Vela X-1 between Feb. 16 and 22, 1984. The UV spectra were obtained exactly simultaneously with EXOSAT observations of the source. Some preliminary X-ray data are presented. The ionization structure of the stellar wind, as diagnosticized by the shape of the Si IV resonance line profiles near binary phase 0.5 shows a clear difference with respect to previous observations. Several possibilities to explain this difference are briefly discussed.

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