Photometric Studies of Similar Mass Ratios of Contact Binaries

Abstract

This article analyzed KIC 3832382 and KIC 7339345, similar mass ratio binary systems that were recorded in the extended Kepler/K2 space telescope using the PHOEBE 0.31a program. The two contact binaries have a mass ratio of 0.61 with fill-out factors of 31.97% and 22.41%, respectively. The fill-out factors reveal that they are a marginal contact configuration. Both binaries show the O'Connell effect. After dark spots were added to the secondary component of KIC 3832382 and to the primary component of KIC 7339345, in addition to a red spot on the secondary component of KIC 7339345, the asymmetric light curves fit well. The evolutionary states of the two components were analyzed, and it was found that their evolution is in the early stages. Secondary components are exactly between the Zero Age Main Sequence (ZAMS) and Terminal Age Main Sequence (TAMS) lines, whereas primary components are entering the main sequence lines. Furthermore, the stability of the binaries was checked under different scenarios, as discussed in the discussion section, and it was revealed that they are relatively stable.