First comprehensive study of W-type W UMa eclipsing binary V1036 Her

Abstract

CCD photometry of the eclipsing binary system V1036 Her was performed using Johnson V filter in Dr. Mojtahedi Observatory of the University of Birjand during July-August 2017 and July 2018. Moreover, the spectroscopy of the system was carried out by TRES during April 2018. A mass ratio of 3.07(27)is obtained and an initial effective temperature of 5500 was suggested. For the first time, the relative and absolute parameters of the system are determined by analyzing the light curve and radial velocity data. The results indicate that V1036 Her is a Wsubtype W UMa system with a degree of overcontact of 22%. The analysis of the period change shows that the period of the system changes with the rate of P˙ = 2.23(4)× 10^ 7day/year. With the assumption of the system mass conservation, a mass transfer rate from the primary to the secondary component of m˙ 1 = 1.00(3) × 10^ 7M⊙/year is probable. Additionally, a periodic behavior with a period of about 10 years is observed in the OC curve, which predicts the possibility of a third body with a minimum mass of 0.14(1) M⊙.