A 0.24+0.18 M double-lined eclipsing binary from the HATSouth survey
Article
Article Title | A 0.24+0.18 M double-lined eclipsing binary from the HATSouth survey |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Zhou, G. (Author), Bayliss, D. (Author), Hartman, J. D. (Author), Rabus, M. (Author), Bakos, G. A. (Author), Jordan, A. (Author), Brahm, R. (Author), Penev, K. (Author), Csubry, Z. (Author), Mancini, L. (Author), Espinoza, N. (Author), de Val-Borro, M. (Author), Bhatti, W. (Author), Ciceri, S. (Author), Henning, T. (Author), Schmidt, B. (Author), Murphy, S. J. (Author), Butler, R. P. (Author), Arriagada, P. (Author), Shectman, S. (Author), Crane, J. (Author), Thompson, I. (Author), Suc, V. (Author) and Noyes, R. W. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 451 (3), pp. 2263-2277 |
Number of Pages | 15 |
Year | 2015 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stv1070 |
Web Address (URL) | https://academic.oup.com/mnras/article/451/3/2263/1183294 |
Abstract | We report the discovery and characterization of a new M-dwarf binary, with component masses and radii of M1 = 0.244+0.003-0.003 M⊙, R1 = 0.261+0.006-0.009 R⊙, M2 = 0.179+0.002-0.001 M⊙, R2 = 0.218+0.007-0.011 R⊙, 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 1σ, whilst HATS551-027B is inflated by 9 per cent at 2σ 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 α 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. |
Keywords | Binaries: eclipsing; Stars: individual: HATS551-027; Astrophysics - Solar and Stellar Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Australian National University |
Princeton University, United States | |
Pontifical Catholic University of Chile, Chile | |
Max Planck Society, Germany | |
Heidelberg University, Germany | |
Carnegie Institution of Washington, United States | |
Carnegie Observatories Pasadena, United States | |
Center for Astrophysics Harvard and Smithsonian, United States |
https://research.usq.edu.au/item/q6x73/a-0-24-0-18-m-double-lined-eclipsing-binary-from-the-hatsouth-survey
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