Properties of Wolf-Rayet stars in eclipsing binary systems

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Eclipsing Binary Stars, Light Curve, Stellar Mass, Stellar Temperature, Wolf-Rayet Stars, Brightness Temperature, Chromosphere, Electron Energy, Emission Spectra, Line Spectra, Periodic Variations, Stellar Atmospheres, Stellar Evolution, Stellar Luminosity, Stellar Mass Ejection, X Ray Sources

Scientific paper

The 'core' radiuses and temperatures as well as masses of WR stars in the eclipsing WR + OB binary systems V 444 Cyg, CX Cep, CQ Cep, and CV Ser, are presented and it is noted that results from the light curve analysis of V 444 Cyg in the 2460 A-3.5 micron range offer strong support for the Beals (1944) model of WR phenomena. Also given are the results of photometric and spectroscopic investigations of WR stars with low mass companions having optical luminosities of approximately 10 to the 36 ergs/sec, which imply that these are not normal stars. It is suggested that these companions are neutron stars accreting from the stellar wind of the WR stars. The low X-ray luminosity of WR stars with low mass companions implies that the accretion of matter in such systems is distinct from the accretion process in classical X-ray binary systems, and it is noted that the companions' parameters are close to those of helium stars.

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