1. AVEN M. HAMEDAMEN - PhD Astrophysics, Assistant Lecturer, Physics Department, College of Education, Salahaddin
University-Erbil, Iraq.
2. ISMAIL MUSA MURAD - Ph.D. Astrophysics, Assistant professor, Physics Department, College of Education, Salahaddin
University-Erbil, Iraq. Ph.D. Astrophysics, Assistant professor, Physics Department, College of
Education, Tishk International University -Erbil, Iraq.
This investigation analyzed the eclipsing binary system's VX Lac light curve and period simultaneously. The W-D code was used to analyze the light curves of the system's B, V, and R filters. According to the findings, VX Lac is an Algol-type binary with a mass ratio of q = 0.27, with the less massive secondary component occupying its Roche lobe. The orbital period behavior of the system was analyzed utilizing the light time effect (LITE) of a third body. The O-C analysis yielded a mass transfer coefficient of dM/dt = 1.86 Myr1 and a minimum mass of M3 = 0.57Mʘ for the third body. As the O-C diagram reveals another cyclic variation, the mass transfer and the third body residuals were also analyzed. Under the stellar metallicity and third-body hypotheses, this periodic variation was examined.
binaries: eclipsing — stars: fundamental parameters — stars: individual (VX Lac), Metalcity, Third body.