Volume 508, Number 1, December II 2009
|Page(s)||391 - 394|
|Section||Stellar structure and evolution|
|Published online||08 October 2009|
The masses and radii of HD 186753B and TYC7096-222-1B: the discovery of two M-dwarfs that eclipse A-type stars
Astrophysics Group, Keele University, Keele, Staffordshire ST5 5BG, UK e-mail: firstname.lastname@example.org
2 Centre for Astrophysics & Planetary Science, School of Physical Sciences, University of Kent, Canterbury, Kent CT2 7NH, UK
3 School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife KY16 9SS, UK
4 Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, 1290 Sauverny, Switzerland
5 Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17, Bat. B5C, Liège 1, Belgium
6 Vanderbilt University, Department of Physics and Astronomy, Nashville, TN 37235, USA
7 Astrophysics Research Centre, School of Mathematics & Physics, Queens University, University Road, Belfast BT7 1NN, UK
8 Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK
Accepted: 1 October 2009
We present observations of two new single-lined eclipsing binaries, both consisting of an Am star and an M-dwarf, discovered by the Wide Angle Search for Planets transit photometry survey. Using WASP photometry and spectroscopic measurements we find that HD 186753B has an orbital period of days, a mass of and radius of ; and that TCY7096-222-1B has an orbital period of days, a mass of between 0.29 and 0.54 depending on eccentricity and radius of . We find that the Am stars have relatively low rotational velocities that closely match the orbital velocities of the M-dwarfs, suggesting that they have been “spun-down” by the M-dwarfs.
Key words: binaries: eclipsing / stars: early-type / stars: late-type / stars: individual: HD 186753 / stars: individual: TCY7096-222-1
© ESO, 2009
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