Abstract The first light curve solutions of the stars EW and HN in the Pisces constellation are presented. Photometry, and its’ periodic changes are calculated and discussed. The analysis of the O-C diagram is done by the MCMC approach in the OCFit code and a new ephemeris is provided for the two binary systems. The results show that EW Psc is a near contact eclipsing binary system with a photometric mass ratio q = 0.587, and the fillout factor is -0.034 and -0.018 for the primary and secondary components, respectively. The solution results also show that the system HN Psc is a weak-contact W UMa eclipsing binary with a photometric mass ratio q = 0.853, and with a fillout factor of 5.6%. The light curves solutions required a cold spot to account for the O'Connell effect.

中文翻译：

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EW Psc和HN Psc的第一光曲线解及周期变化

摘要 给出了双鱼座EW和HN恒星的第一光变曲线解。计算和讨论了光度学及其周期性变化。OC图的分析是通过OCFit代码中的MCMC方法完成的，并为两个二进制系统提供了一个新的星历。结果表明，EW Psc 是一个近接触食双星系统，光度质量比 q = 0.587，主成分和次成分的填充因子分别为 -0.034 和 -0.018。求解结果还表明，系统 HN Psc 是弱接触 W UMa 食双星，光度质量比 q = 0.853，填充因子为 5.6%。光变曲线解决方案需要一个冷点来解释奥康奈尔效应。