|
|
|
|
|
| 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 | | Volume: | 451 | | 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 | | Identifiers: | ISSN:0035-8711
URL:http://cdsads.u-strasbg.fr/abs/2015MNRAS.451.2263Z
| |
|
|
|
The scope and number of records on eDoc is subject
to the collection policies defined by each institute
- see "info" button in the collection browse view.
|
|
Advanced