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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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
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:	Date Event 11 December 2009 Published
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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