A new detached K7 dwarf eclipsing binary system
| dc.creator | Young, T. B. | |
| dc.creator | Hidas, M. G. | |
| dc.creator | Webb, J. K. | |
| dc.creator | Ashley, M. C. B. | |
| dc.creator | Christiansen, J. L. | |
| dc.creator | Derekas, A. | |
| dc.creator | Nutto, C. | |
| dc.date | 2007-03-22 | |
| dc.date.accessioned | 2026-07-07T07:53:08Z | |
| dc.date.available | 2026-07-07T07:53:08Z | |
| dc.description | We present an analysis of a new, detached, double-lined eclipsing binary system with K7 Ve components, discovered as part of the University of New South Wales Extrasolar Planet Search. The object is significant in that only 6 other binary systems are known with comparable or lower mass. Such systems offer important tests of mass-radius theoretical models. Follow-up photometry and spectroscopy were obtained with the 40-inch and 2.3m telescopes at SSO respectively. An estimate of the radial velocity amplitude from spectral absorption features, combined with the orbital inclination (83.5 deg) estimated from lightcurve fitting, yielded a total mass of M=(1.041 +/- 0.06)M_sun and component masses of M_A=(0.529 +/- 0.035)M_sun and M_B=(0.512 +/- 0.035)M_sun. The radial velocity amplitude estimated from absorption features (167 +/- 3)kmps was found to be less than the estimate from the H_alpha emission lines (175 +/- 1.5)kmps. The lightcurve fit produced radii of R_A=(0.641 +/- 0.05)R_sun and R_B=(0.608 +/- 0.06)R_sun, and a temperature ratio of T_B/T_A=0.980 +/- 0.015. The apparent magnitude of the binary was estimated to be V=13.9 +/- 0.2. Combined with the spectral type, this gave the distance to the binary as 169 +/- 14 pc. The timing of the secondary eclipse gave a lower limit on the eccentricity of the binary system of 0.0025 +/- 0.0005. This is the most statistically significant non-zero eccentricity found for such a system, possibly suggesting the presence of a third companion. | |
| dc.description | 6 pages, published in MNRAS (08/2006) | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0703579 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0703579 | |
| dc.identifier | 2006MNRAS.370.1529Y | |
| dc.identifier | doi:10.1111/j.1365-2966.2006.10569.x | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/126139 | |
| dc.subject | Astrophysics | |
| dc.title | A new detached K7 dwarf eclipsing binary system | |
| dc.type | text |