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Issue A&A
Volume 506, Number 1, October IV 2009
The CoRoT space mission: early results
Page(s) 159 - 165
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361/200911903
Published online 11 August 2009

A&A 506, 159-165 (2009)
DOI: 10.1051/0004-6361/200911903

HD 51106 and HD 50747: an ellipsoidal binary and a triple system observed with CoRoT

N. Dolez1, S. Vauclair1, E. Michel2, A. Hui-Bon-Hoa1, G. Vauclair1, D. Le Contel3, P. Mathias3, E. Poretti4, P. J. Amado5, M. Rainer4, R. Samadi2, A. Baglin2, C. Catala2, M. Auvergne2, K. Uytterhoeven4, 6, and J.-C. Valtier3

1  Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 Avenue Edouard Belin, 31400 Toulouse, France
    e-mail: ndolez@ast.obs-mip.fr
2  Observatoire de Paris, LESIA, FRE 2461, 92195 Meudon, France
3  Dpt Fizeau, UMR 6525 Observatoire de la Côte d'Azur/CNRS, BP 4229, 06304 Nice Cedex 4, France
4  INAF – Osservatorio Astronomico di Brera, via Bianchi 46, 23807 Merate, Italy
5  Instituto de Astrofísica de Andalucía-CSIC, PO Box 3004, 18080 Granada, Spain
6  Laboratoire AIM, CEA/DSM CNRS Université Paris Diderot, CEA, IRFU, SAp, Centre de Saclay, 91191 Gif-sur-Yvette, France

Received 20 February 2009 / Accepted 30 July 2009

Abstract
Context. We present an analysis of the observations of HD 51106 and HD 50747 by the satellite CoRoT, obtained during its initial run, and of the spectroscopic preparatory observations.
Aims. We complete an analysis of the light curve, extract the main frequencies observed, and discuss some preliminary interpretations about the stars.
Methods. We used standard Fourier transform and pre-whitening methods to extract information about the periodicities of the stars.
Results. HD 51106 is an ellipsoidal binary, the light curve of which can be completely explained by the tidal deformation of the star and smaller secondary effects. HD 50747 is a triple system containing a variable star, which exhibits many modes of oscillation with periods in the range of a few hours. On the basis of this period range and the analysis of the physical parameters of the star, we conclude that HD 50747 is a $\gamma$-Doradus star.


Key words: stars: individual: HD 50747 -- stars: oscillations -- stars: chemically peculiar



© ESO 2009


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