Volume 543, July 2012
|Number of page(s)||8|
|Section||Stellar structure and evolution|
|Published online||03 July 2012|
Precise modeling of the exoplanet host star and CoRoT main target HD 52265
Institut de Recherche en Astrophysique et Planétologie, Observatoire
Midi-Pyrénées, CNRS, Université Paul Sabatier,
14 Avenue Édouard Belin,
2 Institut universitaire de France, 103 boulevard Saint Michel, 75005 Paris, France
3 Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany
4 Institut für Astrophysik, Georg-August-Universität Göttingen, Friedrich-Hundt-Platz 1, 37077 Göttingen, Germany
5 High Altitude Observatory, NCAR, PO Box 3000, Boulder, CO 80307, USA
6 Canadian Space Agency, 6767 Boulevard de l’Aroport, Saint-Hubert, QC, J3Y 8Y9, Canada
Accepted: 23 May 2012
Aims. This paper presents a detailed and precise study of the characteristics of the exoplanet host star and CoRoT main target HD 52265, derived from asteroseismic studies. We compare our results with previous estimates, and provide a comprehensive summary and discussion.
Methods. Our basic method is similar to that previously used by the Toulouse group for solar-type stars. Models are computed with various initial chemical compositions and the computed p-mode frequencies are compared with the observed ones. All models include atomic diffusion and we discuss the importance of radiative accelerations. Several tests are used, including the usual frequency combinations and the fits to the échelle diagrams. Possible surface effects are introduced and discussed. Automatic codes are also used to identify the best-fit model for this star (SEEK and AMP) and their results are compared with those obtained with the detailed method.
Results. We find precise results for the mass, radius, and age of this star, as well as its effective temperature and luminosity. We also estimate the initial helium abundance. These results are important for the characterization of the star-planet system.
Key words: planet-star interactions / stars: interiors / stars: evolution / stars: late-type / stars: fundamental parameters / asteroseismology
© ESO, 2012
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