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Photoelectric photometry of eclipsing contact binaries: U Peg, YY CrB, OU Ser and EQ Tau

Pribulla, T.; Vanko, M.

New photoelectric UBV observations of the eclipsing contact binary systems U Peg, YY CrB, OU Ser and EQ Tau obtained from August 2000 to October 2001 are presented and analyzed. The (O-C) diagram of U Peg indicates a decrease of the orbital period combined with a quasi-periodic variation. In the case of EQ Tau the long-term period changes can be i…