Fatemeh Davoudi, Atila Poro, Fahri Alicavus, Afshin Halavati, Saeed Doostmohammadi, AmirAbbas Shahdadi, Sareh Vahedi, Arman Pishahang, Maryam Zare, Milad Jamali, AmirMohammad Salajeghe, Faezeh Jahediparizi, Hassan Ashta, Seyed Mohsen Shojaatalhosseini
August 3, 2020
New observations of the eclipsing binary system V1848 Ori were carried out using the V filter resulting in a determination of new times of minima and new ephemeris were obtained. We presented the first complete analysis of the system’s orbital period behavior and analysis of O-C diagram done by the GA and MCMC approaches in OCFit code. The O-C diagram demonstrates a sinusoidal trend in the data; this trend suggests a cyclic change caused by the LITE effect with a period of 10.57 years and an amplitude of 7.182 minutes. It appears that there is a third body with mass function of f ( m 3 ) = 0.0058 M⊙ in this binary system. The light curves were analyzed using the Wilson-Devinney code to determine some geometrical and physical parameters of the system. These results show that V1848 Ori is a contact W UMa binary system with the mass ratio of q = 0.76 and a weak fillout factor of 5.8%. The O’Connell effect was not seen in the light curve and there is no need to add spot.