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We present the photometric results of the eclipsing cataclysmic variable (CV) WZ Sge near the period minimum (Pmin ). Eight new mid-eclipse times were determined and the orbital ephemeris was updated. Our result shows that the orbital period of WZ Sge is decreasing at a rate of P˙=−2.72(±0.23)×10−13ss−1. This secular decrease, coupled with previous detection of its donor, suggest that WZ Sge is a...
By using our twelve new CCD times of light minimum of OY Carinae (OY Car) together with those collected from the literature, it is found that the O–C curve of OY Car shows a downward parabola with an amplitude of 27.8s and a cyclic change of a period 14.0yr. The period decrease is opposite to the hypothesis of mass transfer, and it cannot be explained by angular momentum loss via gravitational radiation...
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