Institute of Astronomy

Hydrogen in Helium White Dwarf Mergers

SpeakerTalk DateTalk Series
Philip Hall27 July 2016Binary Stars Talks


An isolated hot subdwarf might be formed by the merging of two helium-core white dwarfs. Before merging, the helium-core white dwarfs have hydrogen-rich envelopes. The mass of hydrogen that survives the merger and subsequently diffuses to the surface dictates the effective temperature of the resulting hot subdwarf. We find the mass of hydrogen at the start and end of a double helium white dwarf merger and thus test the extent to which the observed isolated hydrogen-rich hot subdwarfs can be explained as the remnants of these mergers.