White Dwarfs in NGC 6791: Avoiding the Helium Flash

Details White Dwarfs in NGC 6791: Avoiding the Helium Flash White Dwarfs in NGC 6791: Avoiding the Helium Flash

2005-07-12

arxiv.org/abs/astro-ph/0507297v1

Astrophys.J.635:522-526,2005

Astronomy and Astrophysics

Astrophysics

4 pages, 4 postscript figures, submitted to ApJ

Scientific paper

10.1086/496951

We propose that the anomalously bright white dwarf luminosity function observed in NGC 6791 (Bedin et al 2005) is the consequence of the formation of 0.5 Msun white dwarfs with Helium cores instead of Carbon cores. This may happen if mass loss during the ascent of the Red Giant Branch is strong enough to prevent a star from reaching the Helium flash. Such a model can explain the slower white dwarf cooling (relative to standard models) and fits naturally with scenarios advanced to explain Extreme Horizontal Branch stars, a population of which are also found in this cluster.

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