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Radio and X-Ray Emissions from Chemically Peculiar B- and A-Type Stars: Observations and a Model

Published online by Cambridge University Press:  12 April 2016

Jeffrey L. Linsky
Jeffrey L. Linsky*
Affiliation:
Joint Institute for Laboratory Astrophysics, National Institute of Standards and Technology and University of Colorado, Boulder, CO 80309-0440.
*
1Staff member, Quantum Physics Division, National Institute of Standards and Technology

Abstract

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Conventional wisdom holds that early-type and late-type stars have very different outer atmospheres, because the early-type stars lack deep convective zones. I argue that the magnetic chemically peculiar (CP) stars hotter than about spectral type A2 display many of the activity phenomena seen in the most active late-type stars. In particular, many CP stars are luminous nonthermal radio and coronal x-ray sources like the RS CVn systems. A wind-fed magnetosphere model has been proposed to explain both the nonthermal radio and the x-ray emission. In this model the stellar wind plays the role of a mechanical energy source analogous to the role played by convection in the active late-type stars.

Type
VI. Magneto-Hydrodynamical Phenomena in CP Stars
Information
International Astronomical Union Colloquium , Volume 138: Peculiar versus Normal Phenomena in A-Type and Related Stars , 1993 , pp. 507 - 516
Copyright
Copyright © Astronomical Society of the Pacific 1993

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