Parameters of two low-mass contact eclipsing binaries near the short-period limit

Abstract

The two objects 1SWASP J150822.80-054236.9 and 1SWASP J160156.04+202821.6 were initially detected from their SuperWASP archived light curves as candidate eclipsing binaries with periods close to the short-period cut-off of the orbital period distribution of main sequence binaries, at ~0.2 d. Here, using INT spectroscopic data, we confirm them as double-lined spectroscopic and eclipsing binaries, in contact configuration. Following modelling of their visual light curves and radial velocity curves, we determine their component and system parameters to precisions between ~2 and 11%. The former system contains 1.07 and 0.55 M_sun components, with radii of 0.90 and 0.68 R_sun respectively; its primary exhibits pulsations with period 1/6 the orbital period of the system. The latter contains 0.86 and 0.57 M_sun components, with radii of 0.75 and 0.63R_sun respectively.

10 pages, 29 figures. Accepted for publication in Astronomy & Astrophysics

References in corpus (3)

• The Dartmouth Stellar Evolution Database
• The short period end of the contact binary period distribution based on the All Sky Automated Survey (ASAS)
• Period decrease in three SuperWASP eclipsing binary candidates near the short-period limit

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