Photometric Studies of the Eclipsing Binary DS Psc

New multi-color photometry and spectroscopic observation were made on the eclipsing binary DS Psc from 2009 to 2014, leading to the light curves in the B, V, and R bands with a complete phase coverage. Forty-one new times of light minimum are determined, and the spectral type of the binary system is firstly deduced. The O-C method is applied to obtain a new orbital period and the epoch formula, in combination with the times of light minimum in literature. The light curves are fitted to derive the photometric solution of the binary system firstly by using the Wilson-Devinney code. The result shows that DS Psc is an over-contact binary system with the spectral type of G7 V, the orbital inclination of 66.6°, and the mass ratio of 2.506. Since the less-massive component has a higher surface temperature than the more-massive one, DS Psc should belong to the W subtype of W UMa binary stars.