Volume 450, Number 1, April IV 2006
|Page(s)||219 - 225|
|Section||Stellar structure and evolution|
|Published online||03 April 2006|
Are luminous and metal-rich Wolf-Rayet stars inflated?
Astronomical Institute, Radboud Universiteit Nijmegen, Toernooiveld 1, 6525 ED, Nijmegen, The Netherlands e-mail: firstname.lastname@example.org
2 Sterrenkundig Instituut, Postbus 80 000, 3508 TA Utrecht, The Netherlands
Accepted: 23 November 2005
Aims.We investigate the influence of metallicity and stellar wind mass loss on the radius of Wolf-Rayet stars.Methods.We have calculated chemically homogeneous models of Wolf-Rayet stars of 10 to 200 for two metallicities ( and ), without mass loss, using OPAL opacities. We also constructed theoretical helium main sequences for 15, 18, 24 and 30 with stellar wind mass loss rates of and and models for a star for a few intermediate values of mass loss rate.Results.We confirm the radius extension for luminous, metal-rich Wolf-Rayet stars reported previously by Ishii et al. (1999, PASJ, 51, 417), i.e. the inflation of the hydrostatic stellar radius. We also show that for small values of the stellar wind mass loss rate, an extended envelope structure is still present. However, for mass loss rates above a critical value, for which we derive an expression, Wolf-Rayet radii decrease and the stellar structure becomes compact. We briefly discuss possible evolutionary and observational consequences of an inflated envelope for a mass losing Wolf-Rayet star.
© ESO, 2006
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.