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Optical and X-ray observations of stellar winds in Wolf-Rayet binaries

Published online by Cambridge University Press:  07 August 2017

A. M. Cherepashchuk
A. M. Cherepashchuk*
Affiliation:
Sternberg Astronomical Institute Universitetskij prospect 13, 119899 Moscow, Russia

Abstract

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New spectrophotometric, photometric and polarimetric observations of V444 Cygni confirm the basic conclusion that the WN5 star has a small core radius (rc < 4 R⊙) and a high core temperature (Tc > 60 000 K), which are characteristic of massive helium stars. Values of rc < 3 — 6 R⊙ and Tc > 70 000 — 90 000 K for the core of the WN7 star in the Cygnus X-3 system agree well with this conclusion. A clumping structure of WR winds is suggested. X-ray observations of colliding winds in WR+O binaries suggest radial expansion and anomalous chemical composition of WR winds.

Keywords

stars: Wolf-RayetbinarieswindsX-rays
Type
Session V - Stellar winds and massive binary evolution
Information
Symposium - International Astronomical Union , Volume 163: Wolf-Rayet Stars: Binaries, Colliding Winds, Evolution , 1995 , pp. 262 - 270
Copyright
Copyright © Kluwer 1995 

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