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Issue A&A
Volume 400, Number 1, March II 2003
Page(s) 63 - 79
Section Galactic structure and dynamics
DOI http://dx.doi.org/10.1051/0004-6361:20021884



A&A 400, 63-79 (2003)
DOI: 10.1051/0004-6361:20021884

The effects of binaries on the evolution of Wolf-Rayet type spectral features in starbursts

J. Van Bever and D. Vanbeveren

Astrophysical Institute, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
    e-mail: dvbevere@vub.ac.be
(Received 18 March 2002 / Accepted 27 November 2002)

Abstract
In the present paper we investigate in detail the effects of binaries with initial period between 1 day and 10 years on theoretical simulations of Wolf-Rayet (WR) type spectral features in starbursts. We focus on the evolution of the nebular $H_{\beta}$ line in starburst in general, on the intensity ratios $I(\mbox{nebular He II}\;\lambda 4686)/I(H_{\beta})$ , $I(\mbox{blue bump})/I(H_{\beta})$, and $I(\mbox{red bump})/I(H_{\beta})$ as a function of the equivalent width of $H_{\beta}$ of WR galaxies in particular. The binary evolutionary processes that dominate the evolution of the considered spectral features are the Roche lobe overflow in case Br systems, the mass transfer efficiency, and the merger rate. We show that the predictions on nebular He II depend critically on the uncertainties in the theory of WR atmospheres and particularly on uncertainties in the treatment of the subsonic velocity region of the WR wind. The observations of low metallicity starbursts are best reproduced by a theoretical model with a significant number of binaries and with a metallicity-dependent WR wind.


Key words: stars: evolution -- stars: binaries: general -- stars: Wolf-Rayet

Offprint request: J. Van Bever, jvbever@vub.ac.be

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