A population of binaries in the Asymptotic Giant Branch of 47 Tucanae?

Details A population of binaries in the Asymptotic Giant Branch of 47 Tucanae? A population of binaries in the Asymptotic Giant Branch of 47 Tucanae?

2006-10-10

arxiv.org/abs/astro-ph/0610289v1

Astrophys.J.652:L121-L124,2006

Astronomy and Astrophysics

Astrophysics

14 pages, 4 figures, in press on ApJ Letters

Scientific paper

10.1086/510019

We have used a set of archived Hubble Space Telescope/ACS images to probe the evolved populations of the globular cluster 47 Tucanae. We find an excess of Asymptotic Giant Branch (AGB) stars in the cluster core. We interpret this feature as the signature of an extra-population likely made by the progeny of massive stars originated by the evolution of binary systems. Indeed the comparison with theoretical tracks suggests that the AGB population of 47 Tuc can be significantly contaminated by more massive stars currently experiencing the first ascending Red Giant Branch.

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