Physical parameters of the overcontact binary AH Cnc in the old open cluster M 67

Meeting on Astrophysics of Variable Stars -- SEP 05-10, 2005 -- Pecs, HUNGARYWOS: 000237451200060We present a photometric study of the overcontact binary AH Cnc. The CCD observations were done with the Russian-Turkish 1.5 m telescope and the light-curve was solved with the Wilson-Devinney code. The physical parameters of the components have been deduced as M-1 = 1.22 M-circle dot, M-2 = 0.20 M-circle dot, R-1 = 1.37 R-circle dot, R-2 = 0.66 R-circle dot, L-1 = 2.65 L-circle dot and L-2 = 0.63 L-circle dot from the obtained orbital parameters and the distance modules of M67. AH Cue ha's been compared with similar systems in the Hertzsprung-Russell diagram.Research Council of the University of LeuvenKU LeuvenKY is supported by the Research Council of the University of Leuven