Period Discovery and Light Curve Analysis of the Young 25 Ori Association Eclipsing Binary GSC 118-199
Abstract
GSC 118-199 (5-6432) was discovered to be an eclipsing binary by Van Eyken et al. (2011) in their intensive monitoring of the young (7-25 Myr) 25 Ori association as part of the Palomar Transient Factory (PTF) Orion project. However, because of the brightness of the system (Rc = 12.7 mag), their instruments could only accurately monitor the binary during its deep (0.6 mag in Rc) total eclipse. They did not observe enough eclipses to reliably determine a period and no secondary eclipse was ever detected. GSC 118-199 was observed at Eastern University from Feb 2011 - Mar 2013 in order to discover the period and subsequently analyze the light curve of this presumably very young totally eclipsing system. More than 3500 observations in V and Rc were obtained and several primary and secondary eclipses were secured and an accurate period determined. The secondary eclipse depth was measured to be ~0.1 mag in Rc centered at 0.496P in phase. The ephemeris for the system has been determined to be 2455189.72682(5) + 6.185181(4) E. Preliminary light curve analyses indicate that the system is a detached, totally eclipsing binary, where the larger but less massive component is the cooler star by ~3000 K. The system also exhibits a slightly eccentric 0.02) orbit, a typical indicator of youth in a binary system. This poster will investigate the possible ramifications of the unusual nature of this young system with the hope that additional observations obtained in late 2013 will provide additional weight and clarity to the preliminary solution.
- Publication:
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American Astronomical Society Meeting Abstracts #223
- Pub Date:
- January 2014
- Bibcode:
- 2014AAS...22315509B