Mixing, Enhanced Helium and Blue Tails in Globular Clusters

Details Mixing, Enhanced Helium and Blue Tails in Globular Clusters Mixing, Enhanced Helium and Blue Tails in Globular Clusters

2000-12-15

arxiv.org/abs/astro-ph/0012351v1

Astronomy and Astrophysics

Astrophysics

9 pages, 8 figures. Astronomy & Astrophysics, in press

Scientific paper

10.1051/0004-6361:20000210

We investigate the consequences of an increase in the envelope helium abundance of pre-helium flash red giants in globular clusters. Comparing predictions with the CM diagrams of a few crucial GC, one finds no evidence for a substantial increase in the surface helium content of HB members of these clusters, at least for objects in the RR Lyrae region or close to it. The possibility that the most peculiar giants belong to the asymptotic giant branch is discussed. The consequences of a delay in the helium flash are briefly examined.

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