FM17p.29 — Light curve modeling of the short-period W UMa star GSC 02049-01164

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Aug 10th at 6:00 PM until 6:00 PM

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Author(s): Lester Fox-Machado1, Juan Echevarria2, Diego Gonzalez-Buitrago1, Raul Michel1

Institution(s): 1. Instituto de Astronomia-UNAM, 2. Instituto de Astronomia-UNAM

The preliminary results of an analysis of the time-series photometric data of the binary star GSC 02049-01164 (ROTSE1 J164341.65+251748.1) are presented.
GSC 02049-01164 was observed for eight consecutive nights from 2013, May 31 to June 07 UT with the 0.84m telescope of the San Pedro Martir Observatory in Mexico. The data were acquired through a Johnson V filter. The propierties of the GSC 02040-01164 light curve are consistent with a short period contact binary of W UMa type. The light curve is characterized by a small difference between the two out-of-eclipse maxima by about 0.035 mag and a flat bottom at the secondary minimum due to a total eclipse. Moreover, the primary and secondary eclipses accur almost at 0.5 phase interval suggesting a circular orbit. The period of the binary is 0.3256 d. In an effort to gain a better understanding of the binary system and determine its physical properties we have analyzed the light curve with the software PHOEBE V.0 0.31a. We have found that GSC 02049-01164 binary system has a mass ratio of ~ 0.42, an inclination of ~ 85 degrees, a semi-major axis of ~ 2.23 Rsun. The degree of overcontact of the stellar components is about 13 %.