EAS Publications Series
Volume 9, 2003Magnetism and Activity of the Sun and Stars
|Page(s)||277 - 277|
|Published online||17 November 2003|
J. Arnaud and N. Meunier (eds)
EAS Publications Series, 9 (2003) 277
Magnetically confined winds of hot stars
We discuss the interplay between radiatively driven winds and magnetic fields in hot stars. In late main sequence B stars, radiatively driven winds are likely to occur but with a mass loss rate strongly affected by the magnetic field structure at the stellar surface. Away from the stellar surface, the interaction of a radiatively driven wind with a dipolar magnetic field lead to the formation of a large magnetosphere consisting of an extended hot postshock region as well as a dense cooling disk forming near the magnetic equator (Magnetically Confined Wind Shock Model, MCWS). In the context of this model, we try to interpret an extensive set of observations (X-ray, UV and optical data) available for the O7V star Θ1 Ori C as well as the pulsating B star β Cep. We finally show how observations of X-ray lines with the XMM or Chandra spacecrafts could help us to obtain a clearer picture of the interaction between magnetic fields and the winds of hot stars.
© EAS, EDP Sciences, 2003
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