Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-04-19
Astronomy and Astrophysics
Astrophysics
29 pages, 6 figures, accepted for publication in the ApJ
Scientific paper
10.1086/307765
We provide a high dispersion line-by-line abundance analysis of five red HB stars in the extremely metal rich galactic globular cluster NGC 6553. These red HB stars are significantly hotter than the very cool stars near the tip of the giant branch in such a metal rich globular cluster and hence their spectra are much more amenable to an abundance analysis than would be the case for red giants. We find that the mean [Fe/H] for NGC 6553 is -0.16 dex, comparable to the mean abundance in the galactic bulge found by McWilliam & Rich (1994) and considerably higher than that obtained from an analysis of two red giants in this cluster by Barbuy etal (1999). The relative abundance for the best determined alpha process element (Ca) indicates an excess of alpha process elements of about a factor of two. The metallicity of NGC 6553 reaches the average of the Galactic bulge and of the solar neighborhood.
Behr Bradford Bartholomew
Carretta Eugenio
Cohen Judith Gamora
Gratton Raffaele G.
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