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Rotationally Modulated Winds of O Stars

Published online by Cambridge University Press:  12 April 2016

Alex W. Fullerton
Alex W. Fullerton*
Affiliation:
Dept. of Physics and Astronomy, University of Victoria, Victoria, BC, Canada; and FUSE Science Operations Center, Dept. of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA

Abstract

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The stellar wind diagnostics of some well-studied O stars exhibit cyclical variations with periods that are probably related to the rotational period of the underlying star. This rotational modulation is usually attributed to large scale, persistent structures in the wind, which are thought to be generated and maintained by photospheric processes that alter the emergence of the wind from different regions of the stellar surface. In this review, three case studies are used to illustrate the patterns of variability that are attributed to rotational modulation and to highlight some open issues connected with this hypothesis. The problems associated with establishing the occurrence of rotational modulation rigorously are also discussed.

Type
Section I Observations of Non-spherical Winds
Information
International Astronomical Union Colloquium , Volume 169: Variable and Non-spherical Stellar Winds in Luminous Hot Stars , 1999 , pp. 3 - 10
Copyright
Copyright © Springer-Verlag 1999

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