2009A&A...508..391B

Query : 2009A&A...508..391B

2009A&A...508..391B - Astronomy and Astrophysics, volume 508, 391-394 (2009/12-2)

The masses and radii of HD186753B and TYC7096-222-1B: the discovery of two M-dwarfs that eclipse A-type stars.

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 D.L., QUELOZ D., TRIAUD A.H.M.J. and WEST R.G.

Abstract (from CDS):

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 HD186753B has an orbital period of P=1.9194 days, a mass of M=0.24±0.02M_☉ and radius of R=0.31^+0.06_–0.06R_☉; and that TYC7096-222-1B has an orbital period of P=8.9582 days, a mass of between 0.29 and 0.54M_☉ depending on eccentricity and radius of R=0.263^+0.02_–0.07R_☉. 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.

Abstract Copyright: ∼

Journal keyword(s): binaries: eclipsing - stars: early-type - stars: late-type - stars: individual: HD 186753 - stars: individual: TYC 7096-222-1

Simbad objects: 3

Full paper

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Number of rows : 3

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Sp type	#ref 1850 - 2023	#notes
1	HD 8779	PM*	01 26 27.3469188696	-00 23 56.516227080	7.684	6.426	K1III	59	0
2	TYC 7096-222-1	SB*	06 50 29.0839784088	-34 36 17.745454332	10.72	10.28	Am+M	3	1
3	HD 186753	EB*	19 47 10.7653348152	-23 22 52.087118736	9.08	8.80	A2(m)A5-F0	10	1

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