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Observed instabilities in OB and Wolf-Rayet stars

Published online by Cambridge University Press:  26 May 2016

Sergey V. Marchenko
Sergey V. Marchenko*
Affiliation:
Department of Physics and Astronomy, Western Kentucky University, 1 Big Red Way, Bowling Green, KY 42101-3576, USA

Abstract

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A wealth of recent observations confirms that the fast, dense winds of OB and Wolf-Rayet (WR) stars are highly structured, with the structures resulting from the inherently unstable nature of a radiatively-driven wind, as well as being triggered from the underlying photosphere. This review mainly addresses variability patterns observed in the winds and photospheric regions of presumably single stars. Schematically we divide the detectable structures into two broad categories: small-scale and large-scale inhomogeneities, with the former mainly of a stochastic behavior/origin, and the latter frequently demonstrating a recurrent, even periodic, behavior. We then discuss the nature and nurture of instabilities, highlighting phenomenological similarities and differences in the variability of OB and WR stars.

Type
Part 2. Interiors of Massive Stars
Information
Symposium - International Astronomical Union , Volume 212: A Massive Star Odyssey: From Main Sequence to Supernova , 2003 , pp. 296 - 307
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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