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Wolf-Rayet Stars in the Magellanic Clouds: Spectroscopic Binaries and Masses

Published online by Cambridge University Press:  14 August 2015

A.F.J. Moffat
A.F.J. Moffat*
Affiliation:
Département de physique, Université de Montréal

Abstract

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Repeated spectra to V-mag 13.0 (13.5) have been obtained since 1978 for the 25 (5) brightest WR stars in the LMC (SMC). More than half of these are orbiting spectroscopic binaries, mainly SB1 for the luminous subclasses WN6-9, and SB2 for the rest. Together with galactic data, the Cloud SB2's lead to a correlation between mass ratio WR/OB and WR spectral subclass for each of the WN and WC sequences. This correlation is interpreted as an evolutionary sequence in which the peeling-off process of the strong stellar wind exposes successively hotter regions and eventually converts WN to WC at a point in time which appears to depend on the ambient metal abundance.

Type
SESSION 7 — WOLF-RAYET STARS IN EXTERNAL GALAXIES
Information
Symposium - International Astronomical Union , Volume 99: Wolf-Rayet Stars: Observations, Physics, Evolution , 1982 , pp. 515 - 521
Copyright
Copyright © Reidel 1982 

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