Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..240..384d&link_type=abstract
Binary Stars as Critical Tools and Tests in Contemporary Astrophysics, International Astronomical Union. Symposium no. 240, he
Astronomy and Astrophysics
Astrophysics
Scientific paper
One of the big uncertainties in evolution of binary stars is the efficiency of mass transfer. Can it be described as a conservative process or is a significant amount of mass and angular momentum lost? As the uncertainties in hydrodynamical simulations are still very large, currently the best way to address the problem is to compare observations with stellar evolution models. Recently Hilditch et al (2005) presented the fundamental parameters of 50 double lined eclipsing binaries in the Small Magellanic Cloud (SMC) with orbital periods between 1 and 5 days. 28 systems are currently transferring mass. This sample is the largest and the most unbiased sample of OB binaries available in any galaxy and therefore suitable to test stellar evolution models of interacting binaries. No applicable models are currently available for the metallicity of the SMC. Therefore we present a large grid of conservative and non-conservative binary evolution tracks computed with using the fast detailed stellar evolution code STARS (based on Eggleton, 1971). We compare observations and models by fitting evolution tracks to each individual system and by comparing the whole sample at once to a synthetic population. In the near future we plan to present detailed binary evolution models for a larger range of metallicities and orbital periods.
de Mink Selma E.
Pols Onno R.
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