Volume 539, March 2012
|Number of page(s)||6|
|Section||Stellar structure and evolution|
|Published online||02 March 2012|
On the Eddington limit and Wolf-Rayet stars
Geneva Observatory, Geneva University,
e-mail: firstname.lastname@example.org; email@example.com; firstname.lastname@example.org
2 Centre de Recherche Astrophysique, École Normale Supérieure de Lyon, 46 allée d’Italie, 69384 Lyon Cedex 07, France
Received: 25 October 2011
Accepted: 13 January 2012
Aims. We examine some properties of stars evolving close to the classical Eddington limit for electron-scattering opacity, when these stars maintain a chemically homogeneous structure as a result of mixing and/or mass loss.
Methods. We consider analytical relations and models computed with the Geneva code.
Results. Homologous, chemically homogeneous stars evolving with a constant Eddington factor obey a relation of the form μ2M = const. This applies, for example, to Wolf-Rayet (WR) stars in stages without hydrogen. The value of the constant may depend on the metallicity, initial mass, evolutionary stage, and physical processes included in the considered homologous evolutionary sequence. An average value of the constant between 20 and 40 in solar units is consistent with the masses of Galactic WR stars.
Key words: stars: evolution / circumstellar matter / stars: mass-loss / stars: massive / stars: Wolf-Rayet
© ESO, 2012
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