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γ2 Velorum, photon loss and the velocity field

Published online by Cambridge University Press:  25 May 2016

Orsola De Marco ,
Werner Schmutz  and
Alex de Koter
Orsola De Marco
Affiliation:
Institute of Astronomy, Swiss Federal Institute of Technology, Zürich, Switzerland
Werner Schmutz
Affiliation:
Institute of Astronomy, Swiss Federal Institute of Technology, Zürich, Switzerland
Alex de Koter
Affiliation:
Astronomical Institute Anton Pannekoek, University of Amsterdam, the Netherlands

Abstract

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The interception of 0.01% of photons (termed photon loss) from the He II Lyα line by Fe VI and Ca V line-opacity can alter substantially the ionization structure of the wind. This is shown to increase the stellar luminosity and hence the wind driving efficiency. Our classical models for WR11 (the WR component in the γ2 Vel binary) underestimate the stellar luminosity as compared to the luminosity derived from the mass-luminosity relation. Here we present a model for WR11 where photon-loss is included. This model succeeds in that it has a higher luminosity for the same spectral appearance and V brightness. Line-blanketing has not yet been added, so that the force-factors and the velocity-law cannot yet be calculated. However, a hydro-dynamical velocity-law derived from a photon-loss model of a WN5 star improves considerably the fit to the narrow He II λ4686 emission line over the use of a β-law.

Type
Part 2. Models for single star evolution of massive stars: wind + atmosphere + interior
Information
Symposium - International Astronomical Union , Volume 193: Wolf-Rayet Phenomena in Massive Stars and Starburst Galaxies , 1999 , pp. 229 - 230
Copyright
Copyright © Astronomical Society of the Pacific 1999 

References

Schaerer, D., Maeder, A. 1992, A&A 263, 129 Google Scholar
Schmutz, W. 1997, A&A 321, 268 Google Scholar