Light curve analysis of three W Ursae Majoris-type binaries: V0449 Peg, EP And, and EK Com

Photometry from online databases were used for the light curve analysis of three eclipsing binary systems, V0449 Peg, EP And, and EK Com. These W UMa-type stars have orbital periods ranging from 0.2 to 0.4 days. Hundreds of new times of minimum for these binaries were collected; from this, estimations were determined of periodic variations and decrease or increase in orbital period. The first analysis of the light curves using the Binary Maker 3.0 and a significant third light contribution were determined for V0449 Peg. The light curve was analyzed using both the Binary Maker 3.0 and PHOEBE 0.31 programs to determine some geometrical and physical parameters of the system and the mass transfer rate is determined for EK Com. Also mass transfer from the less massive component to the more massive one and cyclic variations of the orbital period through the presence of a third body was derived for EP And.