Observations and light curve solutions of the eclipsing binaries usno-b1.0 1395-0370184 and usno-b1.0 1395-0370731

Abstract

We present follow-up photometric observations in Sloan filters g′,i′ of the newly discovered eclipsing stars USNO-B1.0 1395-0370184 and USNO-B1.0 1395-0370731. Our data revealed that their orbital periods are considerably bigger than the previous values. This result changed the classification of USNO-B1.0 1395-0370184 from the ultrashort-period binary (P=0.197 d) to short-period system (P=0.251 d). The light curve solutions of our observations revealed that USNO B1.0 1395-0370184 and USNO-B1.0 1395-0370731 are overcontact binaries in which the components are K dwarfs, close in masses and radii. The light curve distortions were reproduced by cool spots with angular radius of around 20°.