Physical and geometrical parameters of CVBS XI: Cou 1511 (HIP 12552)

Model atmospheres of the close visual binary star Cou 1511 (HIP 12552) are constructed using grids of Kuruz's blanketed models to build the individual synthetic spectral energy distributions (SEDs) for both components. These synthetic SEDs are combined together for the entire system and compared with the observational one following Al-Wardat's complex method for analyzing close visual binary stars. The entire observational SED of the system is used as a reference for comparison between the synthetic SED and the observed one. The parameters of both components are derived as: T a eff = 6180 ± 50K, T b eff = 5865 ± 70K, log g a = 4.35 ± 0.12, log g b = 4.45 ± 0.14, R a = 1.262 ± 0.08 R ⊙ , R b = 1.006±0.07 R ⊙ , L a = 2.09 ± 0.10 L ⊙ and L b = 1.08 ± 0.12 L ⊙ , with spectral types F8V and G1.5V for components (a, b) respectively and age of 3.0 ± 0.9 Gyr. A modified orbit of the system is built and the masses of the two components are calculated as M a = 1.17 ± 0.11 M ⊙ and M b = 1.06 ± 0.10 M ⊙ .