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The mass and helium discrepancy in massive stars: The case Vela X-1 |
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| Authors: | D Vanbeveren A Herrero D Kunze M Van Kerkwijk |
| Institution: | 1. Dept. of Physics, V.U.B., Pleinlaan 2, 1050, Brussels, Belgium 2. Instituto de Astrofisica de Canarias, 38200, La Laguna, Tenerife, Spain 3. Universitats-Sternwarte, Scheinerstr. 1, D-8000, Munchen 80, Germany 4. Astrophysical Institute, University of Amsterdam, Kruislaan 403, NL-1098 SJ, Amsterdam, The Netherlands |
| Abstract: | A NLTE-analysis is presented of high S/N spectra of the optical component of the standard massive X-ray binary Vela X-1. In combination with the orbital parameters we conclude that the optical star is highly helium enriched and is significantly overluminous compared to standard evolutionary tracks of massive accretion stars. We then propose a new accretion model able to explain these features. |
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