publication . Article . Preprint . 2016

hydrogen in hot subdwarfs formed by double helium white dwarf mergers

Hall, Philip D.; Jeffery, C. Simon;
Open Access
  • Published: 29 Sep 2016 Journal: Monthly Notices of the Royal Astronomical Society, volume 463, pages 2,756-2,767 (issn: 0035-8711, eissn: 1365-2966, Copyright policy)
  • Publisher: Oxford University Press (OUP)
Abstract
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 $2 \times 10^{-3}\,\mathrm{M}_{\odot}$ 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...
Subjects
arXiv: Astrophysics::Solar and Stellar AstrophysicsAstrophysics::Galaxy AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsPhysics::Atomic PhysicsAstrophysics::Earth and Planetary Astrophysics
free text keywords: Helium, chemistry.chemical_element, chemistry, Merger process, Astronomy, Merge (version control), Physics, Hydrogen, Astrophysics, Stars, White dwarf, Astrophysics - Solar and Stellar Astrophysics
Related Organizations
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publication . Article . Preprint . 2016

hydrogen in hot subdwarfs formed by double helium white dwarf mergers

Hall, Philip D.; Jeffery, C. Simon;