Helium-Core White Dwarfs in Globular Clusters

Details Helium-Core White Dwarfs in Globular Clusters Helium-Core White Dwarfs in Globular Clusters

2002-06-03

arxiv.org/abs/astro-ph/0206035v1

Astrophys.J. 586 (2003) 1364-1373

Astronomy and Astrophysics

Astrophysics

30 pages, 9 postscript figures, submitted to ApJ

Scientific paper

10.1086/367827

We examine the theoretical implications of a population of low-mass helium-core white dwarfs in globular clusters. In particular, we focus on the observed population in the core of NGC 6397, where several low-mass white dwarf canditates have been identified as ``non-flickerers'' by Cool and collaborators. Age and mass estimates from cooling models, combined with dynamical and evolutionary considerations, lead us to infer that the dark binary companions are C/O white dwarfs rather than neutron stars. Furthermore, we find that the progenitor binaries very likely underwent an exchange interaction within the last 1.e9 years. We examine the prospects for detecting a similar population in other globular clusters, with particular attention to the case of 47 Tuc.

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