Global parameters of the W UMa binaries NSVS 3777464, NSVS 5810460 and ASAS J212236+0657.3

Abstract

Photometric observations in Sloan filters g', i' of the short-period eclipsing stars NSVS 3777464, NSVS 5810460 and ASAS J212236+0657.3 are presented. Their goal was determination of the targets' parameters by light curve solutions. We found the three targets to be overcontact binaries of W subtype: NSVS 3777464 and NSVS 5810460 undergo partial eclipses while ASAS J212236+0657.3 reveals total eclipses. The masses, radii and luminosities of the components of NSVS 3777464 and ASAS J212236+0657.3 were obtained using the results of our light curve solutions and the GAIA distances. The total-eclipsing binary ASAS J212236+0657.3 with well-determined parameters turned out shallow contact binary whose components differ almost 5 times in mass and twice in radius. Due to the lack of GAIA distance for NSVS 5810460, we proposed a procedure for determination of the global parameters of its components based on the results of our light curve solution and the empirical relation period--axis of short-period binaries.