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Are all Trapezium stars magnetic?

Published online by Cambridge University Press:  13 January 2006

G. Alecian ,
O. Richard ,
S. Vauclair  and
T. Montmerle
T. Montmerle*
Affiliation:
Laboratoire d'Astrophysique de Grenoble, BP. 53X, 38400 St. Martin d'Hères, France
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Abstract

Recent X-ray observations of unprecedented length (10 days) of the Orion NebulaCluster with the Chandra satellite (the COUP project) have revealed X-ray flares on the light-curves of late-B and A stars, as well as two new casesof rotational modulation, in addition to the already knowncase of the O7 star θ1 OriC. Weshow that the X-ray emission of A stars (which have neither deepouter convective zones nor strong UV radiation) when detected must be due to thesolar-like magnetic activity of unresolved late-type companions, and that most,if not all, of the O and early Bstars of the Trapezium may be magnetized and emit X-rays by magneticallychannelled wind shocks.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 17: Element Stratification in Stars: 40 Years of Atomic Diffusion , 2005 , pp. 239 - 244
Copyright
© EAS, EDP Sciences, 2005

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