The Photometric Observations and the Light Curve Analysis of U Pegasi

The system of U Pegasi was observed photometrically in B and V filtersin 1998 at Birouni Observatory, University of Shiraz, Iran. Two Lightcurves were obtained and have been analyzed separately of Wilson-Devinneycode. New geometrical and physical elements for the system are given. Theabsolute dimensions of the binary have been derived by combining thephotometric solution with spectroscopic data of the system. The lightcurves analysis indicate that U peg is an overcontact W UMa system with Wtype components which fill their corresponding Roche lobe. The resultsobtained in this study indicate that U Peg may be lied on main sequencewith estimated masses of 0.565 M and 0.362 M.