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.
@article{arxiv.1402.0322,
title = {Parameters of two low-mass contact eclipsing binaries near the short-period limit},
author = {M. E. Lohr and S. T. Hodgkin and A. J. Norton and U. C. Kolb},
journal= {arXiv preprint arXiv:1402.0322},
year = {2014}
}
Comments
10 pages, 29 figures. Accepted for publication in Astronomy & Astrophysics