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The masses and radii of HD 186753B and TYC7096-222-1B : the discovery of two M-dwarfs that eclipse A-type stars
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Bentley, S. J., Smalley, B., Maxted, P. F. L., Hellier, C., Wilson, D. M., Anderson, D. R., Collier Cameron, A., Gillon, M., Hebb, L., Pollacco, Don, Queloz, D., Triaud, A. H. M. J. and West, Richard G. (2009) The masses and radii of HD 186753B and TYC7096-222-1B : the discovery of two M-dwarfs that eclipse A-type stars. Astronomy and Astrophysics, Volume508 (Number 1). pp. 391-394. doi:10.1051/0004-6361/200913154 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361/200913154
Abstract
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 P=1.9194 days, a mass of $M=0.24\pm0.02~M_{\odot}$ and radius of $R=0.31^{+0.06}_{-0.06}~R_{\odot}$; and that TCY7096-222-1B has an orbital period of P=8.9582 days, a mass of between 0.29 and 0.54 $M_{\odot}$ depending on eccentricity and radius of $R=0.263^{+0.02}_{-0.07}~R_{\odot}$. 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.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Astronomy and Astrophysics | ||||
Publisher: | EDP Sciences | ||||
ISSN: | 0004-6361 | ||||
Official Date: | 11 December 2009 | ||||
Dates: |
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Volume: | Volume508 | ||||
Number: | Number 1 | ||||
Page Range: | pp. 391-394 | ||||
DOI: | 10.1051/0004-6361/200913154 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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