Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..240r.264s&link_type=abstract
Binary Stars as Critical Tools and Tests in Contemporary Astrophysics, International Astronomical Union. Symposium no. 240, he
Astronomy and Astrophysics
Astrophysics
2
Scientific paper
Detached eclipsing binary stars are of fundamental importance in providing constraints on theoretical stellar models and the physics they contain. They have been used to calibrate theoretical models and to constrain the amount of convective core overshooting and mixing length used by the models. However, a major limitation in this work is that the age and chemical composition are not in general known for each eclipsing binary, allowing these quantities to be freely adjusted when comparing to theoretical models. I describe an observational program to study eclipsing binaries in a sample open clusters with a range of ages and chemical compositions. In this situation, theoretical predictions are required to simultaneously match the masses, radii and luminosities of the two eclipsing stars and the radiative properties of all the other stars in the cluster. These more detailed constraints mean that subtle physical phenomena, such as convective overshooting and mixing length, can be disentangled from th effects of age and metallicity. I present newly acquired light curves for several eclipsing binaries in the young open cluster NGC 7128. This will uniquely allow mass-radius and mass-luminosity plots to be constructed which contain many stars with the same age and metallicity but a wide range of masses. In addition, the age, chemical composition and distance of NGC 7128 can be obtained without the complications inherent in the comparison of theoretical isochrones to the cluster main sequence in colour-magnitude diagrams.
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