A list of 49 new stellar twins from the Kepler catalogue of eclipsing binary stars

Abstract

ABSTRACT 49 new eclipsing twin binary candidates are identified and analysed based on the Kepler eclipsing binary light curves. Their colours and spectral types are calculated according to our classification. A comparison of the spectral type distribution of eclipsing twin binary systems showed that F-type twins dominate among others, which agrees well with recent studies. The distance of eclipsing twin binaries from the galactic plane shows that F- and G-type twins can be seen at any distance from the galactic plane and most of the known eclipsing binary twins are located within 200 pc of the galactic plane, which could be interpreted as these systems are the members of thin disc population. As a case study, a twin binary system selected from our updated list of twins, V396 Gem, has been analysed with spectroscopic and Kepler data. As a result, we have derived the physical parameters of the components of V396 Gem as M1,2(M⊙) = 1.814 ± 0.114, 1.797 ± 0.114; R1,2(R⊙) = 2.655 ± 0.078, 2.659 ± 0.090; $T_{\mathrm{eff}_{1,2}}(\mathrm{ K})=7000\pm 100$, 6978 ± 100; and [M/H] = 0.11 ± 0.03. We have calculated the evolutionary status of the components by using mesa. Accurately derived physical parameters of the components of V396 Gem have allowed us to determine the age of the system as 1.168 ± 0.149 Byr.