A photometric study of the W UMa-type eclipsing binary system 1SWASP J160156.04 + 202821.6

Abstract

B, V, R and I light curves of the eclipsing binary system 1SWASP J160156.04+202821.6 (J1601) have been constructed, for the first time, based on the CCD observations obtained using the 1.88m telescope of Kottamia Astronomical Observatory (KAO), Egypt, during June, 2013. Twenty new times of minima (8 primary and 12 secondary) have been derived from the presented photometry, and a new ephemeris has been determined. The analysis of the corresponding light curves is made using Djurašević’s inverse problem method. The light-curve asymmetry is explained using a Roche model with spots on system components. The analysis showed that the system is in an overcontact configuration (fover∼13%) with a small temperature difference between the components (ΔT=Th-Tc∼120K), indicating a good thermal contact. The analysis suggests that J1601 is an A-subtype of W UMa-type eclipsing systems, where the primary component is the hotter and more massive one.