HD 51106 and HD 50747: an ellipsoidal binary and a triple system observed with CoRoT*
Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 Avenue Edouard Belin, 31400 Toulouse, France e-mail: firstname.lastname@example.org
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
Accepted: 30 July 2009
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 γ-Doradus star.
Key words: stars: individual: HD 50747 / stars: oscillations / stars: chemically peculiar
Based on observations obtained by CoRoT, a space project operated by the French Space Agency (CNES) with the participation of the Science Program of ESA, ESTEC/RSSD, Austria, Belgium, Brazil, Germany, and Spain. Also based on observations made with ESO telescopes at the La Silla Observatory under the ESO large program LP178.D-0361, at the Observatoire de Haute Provence, INSU/CNRS, France, and on observations collected at the Centro Astronómico Hispano Alemán (CAHA) at Calar Alto, operated jointly by the Max-Planck Institut für Astronomie and the Instituto de Astrofísica de Andalucía.
© ESO, 2009