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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 730356.0, MPI für Astronomie / Publikationen_mpia
A 0.24+0.18 M&sun; double-lined eclipsing binary from the HATSouth survey
Authors:Zhou, G.; Bayliss, D.; Hartman, J. D.; Rabus, M.; Bakos, G. Á.; Jordán, A.; Brahm, R.; Penev, K.; Csubry, Z.; Mancini, L.; Espinoza, N.; de Val-Borro, M.; Bhatti, W.; Ciceri, S.; Henning, T.; Schmidt, B.; Murphy, S. J.; Butler, R. P.; Arriagada, P.; Shectman, S.; Crane, J.; Thompson, I.; Suc, V.; Noyes, R. W.
Date of Publication (YYYY-MM-DD):2015
Title of Journal:Monthly Notices of the Royal Astronomical Society
Start Page:2263
End Page:2277
Audience:Not Specified
Abstract / Description:We report the discovery and characterization of a new M-dwarf binary, with component masses and radii of M_1 = 0.244_{-0.003}^{+0.003} M_{&sun;}, R_1 = 0.261_{-0.009}^{+0.006} R_{&sun;}, M_2 = 0.179_{-0.001}^{+0.002} M_{&sun;}, R_2 = 0.218 _{-0.011}^{+0.007} R_{&sun;}, and orbital period of ˜4.1 d. The M-dwarf binary HATS551-027 (LP 837-20) was identified as an eclipsing binary by the HATSouth survey, and characterized by a series of high-precision photometric observations of the eclipse events, and spectroscopic determinations of the atmospheric parameters and radial velocity orbits. HATS551-027 is one of few systems with both stellar components lying in the fully convective regime of very low mass stars, and can serve as a test for stellar interior models. The radius of HATS551-027A is consistent with models to 1sigma, whilst HATS551-027B is inflated by 9 per cent at 2sigma significance. We measure the effective temperatures for the two stellar components to be Teff, 1 = 3190 ± 100 K and Teff, 2 = 2990 ± 110 K; both are slightly cooler than theoretical models predict, but consistent with other M-dwarfs of similar masses that have previously been studied. We also measure significant H alpha emission from both components of the binary system, and discuss this in the context of the correlation between stellar activity and the discrepancies between the observed and model temperatures.
Free Keywords:binaries: eclipsing; stars: individual: HATS551-027
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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