VLT-UVES abundance analysis of four giants in NGC 6553

A. Alves-Brito, B. Barbuy, M. Zoccali, D. Minniti, S. Ortolani, V. Hill, A. Renzini, L. Pasquini, E. Bica, R. M. Rich, J. Meléndez, Y. Momany

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

Context. Metal-rich globular clusters trace the formation of bulges. Abundance ratios in the metal-rich globular clusters such as NGC 6553 can constrain the formation timescale of the Galactic bulge. Aims. The purpose of this study is to determine the metallicity and elemental ratios in individual stars of the metal-rich bulge globular cluster NGC 6553. Methods. A detailed abundance analysis of four giants in NGC 6553 is carried out, based on optical high-resolution échelle spectra obtained with UVES at the ESO VLT-UT2 Kueyen telescope. Results. A metallicity [Fe/H] = -0.20 dex is derived, together with α-element enhancement of Mg and Si ([Mg/Fe] = +0.28, [Si/Fe] = +0.21), solar Ca and Ti ([Ca/Fe] = +0.05, [Ti/Fe] = -0.01), and a mild enhancement of the r-process element Eu with [Eu/Fe] = +0.10. A mean heliocentric radial velocity of -1.86 km s-1 is measured. We compare our results with previous investigations of the cluster.

Original languageEnglish
Pages (from-to)269-276
Number of pages8
JournalAstronomy and Astrophysics
Volume460
Issue number1
DOIs
Publication statusPublished - 2006

Keywords

  • Galaxy: bulge
  • Globular clusters: individual: NGC 6553
  • Hertzsprung-Russell (HR) and C-M diagrams
  • Stars: abundances

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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