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: email@example.com
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.