BV photometry of close binary star AB And in two observational seasons have been presented. Updated O-C diagram analysis by Kalimeris method yielded the values of 0.0188 day and 0.0065 day as amplitudes of orbital period modulation with P mod1 ∼ 61 yr and P mod2 ∼ 34 yr as the modulation periodicities. Light curve analysis was carried out by W-D method and geometric and physical parameters of the components. Finally, the consequences of period changes have been discussed on the basis of light-time effect due to third body in the system and Applegate mechanism.
New UBV photometry of Algol type binary star U Sge obtained during 1993 are presented, analyzed, and discussed. Wilson-Devinney code was employed to analyze the light curves. Absolute dimensions of the system were obtained, and positions of both components on H-R diagram were specified. Finally through color curve analysis absolute visual magnitudes were determined.
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