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New CCD photometric observations of the eclipsing binary V737 Per have been performed in 2015 and complete BV bands light curves are obtained. From the observations, four times of light minimum are determined. By combining these times of light minimum with those collected from literature, we derive a new linear ephemeris and investigate the orbital period variation. The result shows that no significant...
The orbital period variations of two W UMa-type contact binaries, UY UMa and EF Boo, are analyzed by using all available times of light minimum. It is detected that the general trends of their (O−C) curves show an upward parabolic variation, which reveals their continuous period increases at the rates of dP/dt=2.545×10−7 days yr−1 and dP/dt=2.623×10−7 days yr−1, respectively. Meanwhile, UY UMa also...
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