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

Alexandre David-Uraz, Gregg A. Wade, Véronique Petit, Asif Ud-Doula

Research output: Chapter in Book/Report/Conference proceedingChapter


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.

Original languageEnglish (US)
Title of host publicationMagnetic Fields throughout Stellar Evolution
PublisherCambridge University Press
Number of pages4
ISBN (Print)9781107044982
StatePublished - Aug 2014

Publication series

NameProceedings of the International Astronomical Union
ISSN (Print)1743-9213
ISSN (Electronic)1743-9221

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science


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