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Magnetic Fields and Winds of the Intermediate Helium Stars

Published online by Cambridge University Press:  12 April 2016

Paul K. Barker
Paul K. Barker*
Affiliation:
Astronomy DepartmentUniversity of Western OntarioLondon, Ontario N6A 3K7Canada

Abstract

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The intermediate helium stars are exceedingly rare hot analogs of the classical Ap stars, and are the earliest type stars to possess observable global ordered magnetic fields. A recent discovery is the existence of stellar winds which have large scale magnetospheric structure embedded within them. The nature and geometry of the detected fields are summarized, and the modulation of the circumstellar material by the field is illustrated for two examples: the rapid rotator σ Ori E, and the slow rotator HD 184927. The complex variety of stellar wind phenomenology which may be encountered is displayed by a sample of ten helium strong stars. A few of these objects show Hα emission, and thus are the only known magnetic Be stars.

Type
VI Intermediate Helium Stars
Information
International Astronomical Union Colloquium , Volume 87: Hydrogen Deficient Stars and Related Objects , 1985 , pp. 277 - 296
Copyright
Copyright © Reidel 1986

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