Photometric study of the overcontact binary NSVS2910034

Abstract

We present BVRC+TESS differential photometry of an eclipsing binary system NSVS 2910034. A period analysis reveals unusual variations that are inconsistent with systemic orbital period changes and may be due to surface activity. The best fit models are consistent with a W-type W UMa overcontact binary, consisting of a less massive G7 spectral type star and a more massive K1 spectral type star. An O'Connell effect is present and analyzed. The best fit model represents a very large hot spot that may indicate significant chromospheric activity across a large portion of the stellar surface of the K star.