Apsidal motion analysis of some eclipsing binary systems photometry analysises

In the present thesis, the eclipsing binaries which displaying apsidal motion effect in their orbits, OX Cas, PV Cas, V785 Cas, V821 Cas, CW Cep, DN Cru, V477 Cyg, V478 Cyg, HS Her, CO Lac, RU Mon, V451 Oph, AG Per, V399 Pup, YY Sgr, AO Vel and DR Vul were studied to obtain the elements of apsidal motion in the context of new photoelectric observations. The mean observed internal structure constantsi of these systems were calculated by using apsidal motion parameters. The results based on clasical, relativistic and third bodies in these system were compared with the observed and theoretical model (Claret, 2004). In addition, the HIPPARCOS (ESA, 1997) database and the HIPPARCOS light curves of the systems were searched for the eclipsing binaries having eccentric orbits. V785 Cas, DN Cru and V399 Pup were analyzed by using Wilson - Devinney computer code. We took data of ASAS and HIPPARCOS. Light ? curves of DN Cru and V399 Pup were obtained. The physical and geometrical parameters of these systems have been firstly determined by analysing their light ? curves with the WD computer code. The first ground-based photoelectric observations of V785 Cas were obtained in BVR filters and the resulting light curves were analyzed by using WD computer code.We also found, firstly, time periods of apsidal motion of 66 and 85 years for V785 Cas and V399 Pup, respectively.Key words: Stars, eclipsing binaries, eccentric orbit, apsidal motion, internal-structure constant, period changes, OX Cas, PV Cas, V785 Cas, V821 Cas, CW Cep, DN Cru, V477 Cyg, V478 Cyg, HS Her, CO Lac, RU Mon, V451 Oph, AG Per, V399 Pup, YY Sgr, AO Vel, DR Vul