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Discovery of weak magnetic fields in early B-type stars

Published online by Cambridge University Press:  26 May 2016

Huib F. Henrichs ,
Coralie Neiner  and
Vincent C. Geers
Huib F. Henrichs
Affiliation:
Sterrenkundig Instituut Anton Pannekoek, Universiteit van Amsterdam, Kruislaan 403, NL-1098 SJ, Nederland
Coralie Neiner
Affiliation:
Sterrenkundig Instituut Anton Pannekoek, Universiteit van Amsterdam, Kruislaan 403, NL-1098 SJ, Nederland
Vincent C. Geers
Affiliation:
Sterrenkundig Instituut Anton Pannekoek, Universiteit van Amsterdam, Kruislaan 403, NL-1098 SJ, Nederland

Abstract

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We summarize recent results of magnetic measurements of three bright early B-type stars, β Cep, ζ Cas, and V2052 Oph, which were found to be oblique rotators with a weak magnetic dipole field with typical strength of a few hundred Gauss. From stellar wind studies we could derive their rotational periods very accurately, and match the stellar wind with the magnetic phase. From model atmosphere fits we derive the angles of rotational and magnetic axis. All three stars show some chemical abundance anomaly, presumably associated with the magnetic properties. The stars are also pulsating variables. This is of high asteroseismological interest, since these are the only early-type stars known with observationally determined rotation, pulsation and magnetic properties.

Type
Part 1. Atmospheres of Massive Stars
Information
Symposium - International Astronomical Union , Volume 212: A Massive Star Odyssey: From Main Sequence to Supernova , 2003 , pp. 202 - 203
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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