Contributed Talk - Splinter HotStars

Thursday, 15 September 2022, 17:35   (SFG 1030 / virtual HotStars)

HE 1518-0948 a potential supernova-ejected runaway

Max Pritzkuleit, Stephan Geier, Patrick Neunteufel, Matti Dorsch
University of Potsdam

Hot subdwarf stars of spectral type O and B are the products of binary star evolution. One of the most extreme outcomes are hyperrunaway hot subdwarfs, which were ejected by the supernova explosion of a former white dwarf companion. The resulting ejection velocity can be fast enough to escape the galactic potential. However, US 708 is, so far, the only known object most likely originating from this scenario. Using the most recent Gaia data and theoretical predictions, we are searching for more of these objects. In my talk, I will present the discovery of the extremely helium-rich hot subdwarf HE 1518-0948, which we identify as runaway star coming from the inner part of the Galaxy.