Absolute and geometric parameters of contact binary GW Cnc

Abstract We present the results of our investigation on the geometrical and physical parameters of the W UMa type binary system GW Cnc. We analyzed the photometric data obtained in 2010 and 2011 at Ankara University Observatory (AUO) and the spectroscopic data obtained in 2010 at TUBITAK National Observatory (TUG) by using the Wilson–Devinney (2013 revision) code to obtain the absolute and geometrical parameters. We derived masses and radii of the eclipsing system to be M 1 = 0.257 M ⊙ , M 2 = 0.971 M ⊙ , R 1 = 0.526 R ⊙ and R 2 = 0.961 R ⊙ with an orbital inclination i ( ∘ ) = 83.38 ± 0.25 and we determined the GW Cnc system to be a W-type W UMa over-contact binary with a mass ratio of q = 3.773 ± 0.007 .