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2012MNRAS.419..452Z - Mon. Not. R. Astron. Soc., 419, 452-464 (2012/January-1)
Evolutionary models for double helium white dwarf mergers and the formation of helium-rich hot subdwarfs.
ZHANG X. and JEFFERY C.S.
Abstract (from CDS):
Whilst the hydrodynamics of the merger process remains difficult to compute, it is possible to compute the evolution of a double white dwarf merger following the destruction of one component. In this paper, we describe the evolution following the merger of two helium white dwarfs. We examine three sets of assumptions concerning the distribution of debris material between a disc and a corona.
Our results demonstrate that a model comprising both fast accretion to form a (hot) corona and slow accretion from a (cold) debris disc can reproduce the observed distribution of helium-rich subdwarfs in terms of their surface temperatures, gravities, nitrogen and carbon abundances.
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): stars: abundances - binaries: close - stars: evolution - stars: peculiar - subdwarfs - white dwarfs
Simbad objects: 38
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