SIMBAD references

2016MNRAS.463.2756H - Mon. Not. R. Astron. Soc., 463, 2756-2767 (2016/December-2)

Hydrogen in hot subdwarfs formed by double helium white dwarf mergers.


Abstract (from CDS):

Isolated hot subdwarfs might be formed by the merging of two helium-core white dwarfs. Before merging, helium-core white dwarfs have hydrogen-rich envelopes and some of this hydrogen may survive the merger. We calculate the mass of hydrogen that is present at the start of such mergers and, with the assumption that hydrogen is mixed throughout the disrupted white dwarf in the merger process, estimate how much can survive. We find a hydrogen mass of up to about 2 x 10–3 M in merger remnants. We make model merger remnants that include the hydrogen mass appropriate to their total mass and compare their atmospheric parameters with a sample of apparently isolated hot subdwarfs, hydrogen-rich sdBs. The majority of these stars can be explained as the remnants of double helium white dwarf mergers.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): binaries: close - stars: evolution - subdwarfs - white dwarfs - white dwarfs

Simbad objects: 49

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