Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-04-14
Astronomy and Astrophysics
Astrophysics
7 pages, 2 encapsulated figures, 1 table, use emulateapj.sty, accepted for publication on ApJ Letters
Scientific paper
10.1086/312064
We present observational estimates of DV(Bump-HB) in a sample of 28 Galactic Globular Clusters (GGCs) observed by HST. The photometric accuracy and the sizable number of stars measured in each cluster allowed us to single out the RGB Bump both in metal-poor and in metal-rich GGCs. Empirical values are compared with homogeneous theoretical predictions which account for both H and He burning phases over a wide range of metal abundances (0.0001 < Z < 0.02). We found that, within current observational uncertainties on both iron and $\alpha$-element abundances, theory and observations are in very good agreement, provided that the metallicity scale by Carretta & Gratton (1997) as extended by Cohen et al. (1999) is adopted. Interesting enough, we also found that both theoretical and observed values show a change in the slope of the DV(Bump-HB)-[M/H] relation toward higher metal contents.
Bono Giuseppe
Cassisi Santi
Piotto Giampaolo
Salaris Maurizio
Zoccali Manuela
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