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An Optical and X-Ray Study of the Contact Binary, BH Cassiopeia

Zheng, Jie; Zhang, Yu; Esamdin, Ali +10 more

We present the revised and high-quality CCD time series observations in 2017 and 2018 of the W UMa-type contact binary BH Cas. The combination of our new determinations of minimum times and those collected from the literatures reveal a long-term period increase with a rate of dP/dt = +3.27 × 10^-7 day yr^-1, which can be accoun…