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UBV photometry of the W UMa type eclipsing binary AK Her is presented. Light curves analysis were carried out using W–D code to obtain physical parameters of both components. The updated O–C diagram analysis yielded the values of Pmod1=62.61±0.01 years, Pmod2=25.05±0.01 years and Pmod3=13.91±0.01 years as the modulation periodicities and the values of 2.01×10-8±2.1×10-9 days, 8.9×10-9±2.1×10-9 days...
UBV photometric observations of the active binary star CG Cygnus have been presented and analyzed to obtain absolute parameters of both components. Updated O-C diagram analysis by Kalimeris method yielded the values of 1.55× 10-6 day and 1.4×10-7day as the amplitudes of orbital period modulation, and Pmod1∼ 52.3 yr and Pmod2 ∼ 15.9 yr as the modulation periodicities. Finally, the consequences of period...
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