Abstract
New observations of the eclipsing binary system V1191 Cyg were carried out by using CCD in BVR filters and new times of light minimum and new ephemeris were obtained. For the first time, the O-C curve of this binary was analyzed by using the Kalimeris method and the orbital period and its rate of change were calculated as functions of time. The BVR light curves were analyzed using both the Binary Maker 3.0 and PHOEBE 0.31a programs to determine some geometrical and physical parameters. By analyzing O-C diagram, the period variation was calculated to be dP/dt=3.13×10-6dyr-1 and the rate of mass transfer was Ṁc=5.23×10-7M⊙yr-1.
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