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Photospheric Variability in EUVE Observations of β Canis Majoris (B1 II-III)

Published online by Cambridge University Press:  12 April 2016

David H. Cohen ,
Joseph J. MacFarlane  and
Joseph P. Cassinelli
David H. Cohen
Affiliation:
Department of Astronomy, University of Wisconsin at Madison, 475 No. Charter Street, Madison, Wisconsin, 53706, USA
Joseph J. MacFarlane
Affiliation:
Department of Astronomy, University of Wisconsin at Madison, 475 No. Charter Street, Madison, Wisconsin, 53706, USA
Joseph P. Cassinelli
Affiliation:
Department of Astronomy, University of Wisconsin at Madison, 475 No. Charter Street, Madison, Wisconsin, 53706, USA

Abstract

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The only pulsating early-type star observed by EUVE, the β Cephei variable β CMa, displays periodic variability in its Lyman continuum which is basically consistent with the long-known optical and UV variability. The amplitude of the primary pulsation component is significantly larger in the EUV than in the optical or UV. This is consistent with a temperature change being the explanation for the variability. It is notable that the pulsations have been detected in the Lyman continuum because this part of the spectrum is formed in a much higher layer of the photosphere than either the UV or optical continua.

Type
VII. Photospheres and Winds of Early-Type Stars
Information
International Astronomical Union Colloquium , Volume 152: Astrophysics in the Extreme Ultraviolet , 1996 , pp. 389 - 394
Copyright
Copyright © Kluwer 1996

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