Light curve solutions of the eclipsing eccentric binaries KIC 8111622, KIC 10518735, KIC 8196180 and their out-of-eclipse variability

摘要

We determined the orbits and stellar parameters of three eccentric eclipsingbinaries by light curve solutions of their Kepler data. KIC 8111622 and KIC10518735 undergo total eclipses while KIC 8196180 reveals partial eclipses. Thetarget components are G and K stars, excluding the primary of KIC 8196180 whichis early F star. KIC 8196180 reveals well-visible tidally-induced feature atperiastron, i.e. it is an eclipsing heartbeat star. The characteristics of theobserved periastron feature (shape, width and amplitude) confirm thetheoretical predictions. There are additional out-of-eclipse variations of KIC8196180 with the orbital period which may be explained by spot activity ofsynchronously rotating component. Besides worse visible periastron feature KIC811162 exhibits small amplitude light variations whose period is around 2.3times shorter than the orbital one. These oscillations were attributed tospot(s) on asynchronously rotating component.