2012AJ....144..161K

ω Centauri is the largest globular cluster in the Milky Way and hence contains the largest number of variable stars within a single cluster. The results of photometric solutions are presented for the EA-type binary V239 in this cluster. According to our analysis, V239 is a typical Algol-type binary. We obtain M = 1.20±0.10 M_☉, R = 1.21±0.03 R_☉, and L = 13.68±0.63 L_☉ for the primary component. The secondary component has M = 0.07±0.02 M_☉, R = 0.90±0.03 R_☉, and L = 2.17±0.14 L_☉. The binary system is located in the blue straggler region on the color-magnitude diagram of ω Centauri and the mass of the primary component exceeds the mass of a turnoff star. Therefore, we think that V239 is a blue straggler and that V239 was formed by mass transfer from the present secondary component to the present primary.