Radial velocity and light curves analysis of eclipsing binary system V448Cyg and investigation of its accretion disk model

چکیده مقاله

The V448 Cyg eclipsing binary system has complex light curves and has been repeatedly analyzed by many researchers. In the present study, new photometric data from the TESS catalog were used. Radial velocity and light curves were analyzed simultaneously using PHOEBE. The absolute physical and geometrical parameters of the system were determined. Then, the results were reviewed and compared with the previous models in the literature. By considering the locations of the spots on the stars and the position of the system on the diagram of relative primary radius versus the mass ratio, in the semi-detached model, we investigated the existence of an accretion disk and circumstellar material around the primary star. For this purpose, we used the Shellspec program to find the best model and the theoretical light curve. Then, by examining different situations, we found a wedge-shaped disk around the primary star and a hot spot located on the disk and streamline.