A New Feature Along the Extended Blue Horizontal Branch of NGC 6752

Details A New Feature Along the Extended Blue Horizontal Branch of NGC 6752 A New Feature Along the Extended Blue Horizontal Branch of NGC 6752

2002-07-26

arxiv.org/abs/astro-ph/0207580v1

Astrophys.J. 576 (2002) L65-L68

Astronomy and Astrophysics

Astrophysics

13 pages, 3 figures, accepted by ApJL

Scientific paper

10.1086/343125

In this letter we report on the detection of a new feature in the complex structure of the horizontal branch (HB) of the Galactic globular cluster NGC 6752. In the U vs. (U-V) plane, the HB shows a discontinuity (``jump'') at U-V ~= -1.0 (corresponding T_e ~ 23,000 K). This ``second U-jump'' adds to the u-jump identified by Grundahl et al. (1999) in a dozen of clusters at T_e ~ 11,500 K. We show that this new discontinuity might be due to the combination of post zero age HB evolution and diffusion effects. We identify 11 AGB-manque stars. The comparison between post-HB star counts and evolutionary lifetimes, as predicted by canonical stellar models, shows good agreement, at variance with similar estimates for NGC 6752 available in the literature.

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