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Investigating the origin of cyclical spectral variations in hot, massive stars

Published online by Cambridge University Press:  07 August 2014

Alexandre David-Uraz ,
Gregg A. Wade ,
Véronique Petit  and
Asif ud-Doula
Alexandre David-Uraz
Affiliation:
Queen's University, Canada
Gregg A. Wade
Affiliation:
RMC, Canada
Véronique Petit
Affiliation:
University of Delaware, USA
Asif ud-Doula
Affiliation:
Penn State University, USA
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Abstract

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OB stars are known to exhibit various types of wind variability, as detected in their ultraviolet spectra, amongst which are the ubiquitous discrete absorption components (DACs). These features have been associated with large-scale azimuthal structures extending from the base of the wind to its outer regions: corotating interaction regions (CIRs). There are several competing hypotheses as to which physical processes may perturb the star's surface and generate CIRs, including magnetic fields and non radial pulsations (NRPs), the subjects of this paper with a particular emphasis on the former. Although large-scale magnetic fields are ruled out, magnetic spots deserve further investigation, both on the observational and theoretical fronts.

Keywords

Stars: windsoutflows – stars: massive – stars: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S302: Magnetic Fields throughout Stellar Evolution , August 2013 , pp. 334 - 337
Copyright
Copyright © International Astronomical Union 2014 

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