Other
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aspc..435..375v&link_type=abstract
Binaries - Key to Comprehension of the Universe. Proceedings of a conference held June 8-12, 2009 in Brno, Czech Republic. Edite
Other
Scientific paper
We present the results of a project aimed at determining the first direct distance to the Andromeda Galaxy (M 31) from EBs. A photometric survey was carried out in the North-Eastern part of M 31, providing light curves for almost 4000 variable stars, with over 400 EBs and 400 Cepheids. After a preliminary selection, four EBs were selected for spectroscopic follow up with the Gemini-North telescope. The analysis performed revealed the fundamental properties of several massive stars. Two of these EBs were used to determine a direct distance to M 31 of (m-M)0=24.36±0.08 mag. The other two EBs provided a direct determination of masses and radii of massive stars in another galaxy, enabling a comparison with stellar evolutionary models. In addition, one of these systems is the most massive EB with apsidal motion ever reported, enabling the analysis of the distribution of matter in the interior of stars with masses larger than 40 M&sun;.
Fitzpatrick Edward L.
Guinan Edward F.
Jordi Carme
Mazeh Tsevi
Ribas Ignasi
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