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Photoelectric Observations, Light Curves Analysis and Period Study of the Eclipsing Variable DO Cas

The new B and V photoelectric observations of the beta Lyrae eclipsing binary DO Cas were obtained on 6 nights form December 2000 to January 2001. The observations were made at the Biruni Observatory, Shiraz, Iran and the light curves are analyzed using the Wilson light curve synthesis and differential correction code. So, the relative surface luminosities, new light elements, and new orbital elements have been obtained, and from times of minimum the period is improved. With these and previously published times, the period variation is studied and a constant period is approved, though some authors has mentioned some variations. The solutions of the light curves suggest that DO Cas is a contact binary.