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Öğe The first light curve solutions and period changes of EW Psc and HN Psc(Elsevier, 2020) Davoudi, F.; Poro, A.; Alicavus, F.; Rahimi, J.; Lashgari, E.; Ghanbarzadehchaleshtori, M.; Boudesh, A.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.
