VLT-UVES abundance analysis of four giants in NGC 6553

Details VLT-UVES abundance analysis of four giants in NGC 6553 VLT-UVES abundance analysis of four giants in NGC 6553

2006-09-05

arxiv.org/abs/astro-ph/0609128v2

Astronomy and Astrophysics

Astrophysics

15 pages, 8 figures, A&A, in press

Scientific paper

10.1051/0004-6361:20065488

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. The purpose of this study is determine the metallicity and elemental ratios in individual stars of the metal-rich bulge globular cluster NGC 6553. A detailed abundance analysis of four giants in NGC 6553 is carried out, based on optical high-resolution echelle spectra obtained with UVES at the ESO VLT-UT2 Kueyen telescope. A metallicity [Fe/H]= -0.20 dex is derived, together with $\alpha$-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.

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