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          Institute: MPI für extraterrestrische Physik     Collection: Space Plasma Physics     Display Documents

ID: 10739.0, MPI für extraterrestrische Physik / Space Plasma Physics
Integrated spectroscopy of bulge globular clusters and fields - I. The data base and comparison of individual Lick indices in clusters and bulge
Authors:Puzia, T. H.; Saglia, R. P.; Kissler-Patig, M.; Maraston, C.; Greggio, L.; Renzini, A.; Ortolani, S.
Date of Publication (YYYY-MM-DD):2002-11
Title of Journal:Astronomy & Astrophysics
Journal Abbrev.:Astron. Astrophys.
Issue / Number:1
Start Page:45
End Page:67
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present a comprehensive spectroscopic study of the integrated light of metal-rich Galactic globular clusters and the stellar population in the Galactic bulge. We measure line indices which are defined by the Lick standard system and compare index strengths of the clusters and Galactic bulge. Both metal-rich globular clusters and the bulge are similar in most of the indices, except for the CN index. We find a significant enhancement in the CN Fe index ratio in metal-rich globular clusters compared with the Galactic bulge. The mean iron index Fe of the two metal-rich globular clusters NGC 6528 and NGC 6553 is comparable with the mean iron index of the bulge. Index ratios such as Mgb/(Fe), Mg-2/(Fe), Ca4227/(Fe), and TiO/(Fe), are comparable in both stellar population indicating similar enhancements in individual elements which are traced by the indices. From the globular cluster data we fully empirically calibrate several metallicity-sensitive indices as a function of [Fe H] and find tightest correlations for the Mg-2 index and the composite [MgFe] index. We find that all indices show a similar behavior with galactocentric radius, except for the Balmer series, which show a large scatter at all radii. However, the scatter is entirely consistent with the cluster-to-cluster variations in the horizontal branch morphology.
Free Keywords:Galaxy : globular clusters : general; Galaxy : abundances; Galaxy : formation; stars : abundances
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für extraterrestrische Physik
External Affiliations:Univ Munich, Sternwarte, Scheinerstr 43, D-81679 Munich,; Germany; Univ Munich, Sternwarte, D-81679 Munich, Germany; European So Observ, D-85748 Garching, Germany; Max Planck Inst Extraterr Phys, D-85748 Garching, Germany; Univ Padua, Dept Astron, I-35122 Padua, Italy
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