A comprehensive study of the sdB+dM binary TYC 3315-1807-1

TYC 3315-1807-1 is an sdB+dM binary first reported by Kawka et al. (2010). Archival photometric data indicate the presence of a secondary companion causing a large reflection effect. Spectroscopic observations of the object were carried out from Vainu Bappu Observatory, Kavalur, to probe the nature of the secondary companion and to understand the post common-envelope evolution of such objects. Spectral line equivalent widths (EW) exhibit orbital phase dependent variations, indicating the probable contribution from the secondary. A period variation study of the object was carried out using times of minima obtained from the literature and suggesting a decrease in period. The evolutionary state of the system is evaluated and discussed.