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The Eclipsing Binary System V2154 Cyg : Observations and Models

Authors: J. Fernandes; Oblak, E.; Kurpinska-Winiarska, M.

Ref.: Binary Stars as Critical Tools and Tests in Contemporary Astrophysics, International Astronomical Union. Symposium no. 240, held 22-25 August, 2006 in Prague, Czech Republic, S240, p. 388 (2007)

Abstract: V2154 Cyg is one of the nearest eclipsing binary systems located at 88 pc and discovered by the HIPPARCOS mission. Based on photometric and spectroscopic observations carried out respectively at the Nevada Observatory, Spain (uvby photometry) and by CORAVEL-ELODIE , at the Haute-Provence Observatory, we determine the masses, effective temperature and radius for both components of the eclipsin system. On the other hand we analyse the HR Diagram position of V2154 Cyg A and B by means of the theoretical models. This system is very interesting thanks to the fact that, being composed by coeval stars, the different masses the eclipsing binary components (1.27Mo + 0.76 Mo) allow the comparison between two stars with clear different internal structures and evolutionary regimes, mainly on convection processes. We present preliminary results on the determination of the age and helium of the system.

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