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Magnetism and Activity of the Sun and Stars
J. Arnaud and N. Meunier (eds)
EAS Publications Series, Vol. 9, 2003
DOI: 10.1051/eas:2003109

Discovery of a magnetic field in the B2 IV star $\zeta$ Cassiopeia

V.C. Geers, H.F. Henrichs and C. Neiner

Astronomical Institute "Anton Pannekoek", University of Amsterdam, Kruislaan 403, 1098 SJ, Amsterdam, The Netherlands


Abstract
We report on our discovery of a magnetic field in the B2IV star $\zeta$ Cas. We determine the rotation period from the UV wind behaviour. We summarize the results from spectropolarimetric observations of $\zeta$ Cas obtained in 2001 and 2002 with the MuSiCoS échelle spectropolarimeter at the 2 m Télescope Bernard Lyot (TBL). We also find a non-radial pulsation mode and confirm that the star is N-enriched. This is the third detection of a magnetic field in an early B-type variable star and the first one in a SPB star.



© EAS, EDP Sciences 2003


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