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Hot subdwarf stars (sdO/Bs) are the stripped cores of red giants located atthe bluest extension of the horizontal branch. They constitute the dominantpopulation of UV-bright stars in old stellar environments and are most likelyformed by binary interactions. We perform the first systematic, spectroscopicanalysis of a sample of those stars in the Galactic halo based on data fromSDSS. In the course of this project we discovered 177 close binary candidates.A significant fraction of the sdB binaries turned out to have close substellarcompanions, which shows that brown dwarfs and planets can significantlyinfluence late stellar evolution. Close hot subdwarf binaries with massivewhite dwarf companions on the other hand are good candidates for theprogenitors of type Ia supernovae. We discovered a hypervelocity star, whichnot only turned out to be the fastest unbound star known in our Galaxy, butalso the surviving companion of such a supernova explosion.

Hot subdwarfs in the Galactic halo - Tracers of prominent events in late stellar evolution