Synthetic light curves and orbital solutions of two eclipsing binary systems, V675 Lac and USNO-A2.0 1425-02035807

Abstract

We carried out light curve modeling for all-light curves of the variable W UMa systems V675 Lac and USNO-2035807 using ground-based observations, the Gaia 3rd data release, and ZTF databases by means of the W-D code. The accepted models revealed absolute and physical parameters, which showed that the primary components in both systems are massive and hotter than the secondary ones, and both systems were classified as overcontact. A period study of the system V675 Lac of 19 year duration shows a smooth period increase with the rate dP/dE = 1.8936 × 10^-10 day/cycle. Investigation of the systems evolutionary status showed that the primary components for both systems are situated on the ZAMS track, while their secondary components are situated above the TAMS track.