Surface activity of the G dwarf primary in the quaternary star system V815 Her

Abstract

We investigate the magnetic activity of the G dwarf primary star in the multiple system V815 Herculis. Recently, TESS Sector 26 data have revealed that V815 Her is in fact a four-star system consisting of two close binaries in a long-period orbit. We give preliminary orbital solution for the long-known but unseen "third body" V815 Her `B', which is itself a close eclipsing binary of two M dwarfs. Long-term spot activity of the G dwarf is presented along with the very first Doppler image reconstructions of its spotted surface.

arXiv comment3 pages, poster paper presented at the 21th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (Toulouse, France) in 2022