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

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

36 Citas (Scopus)

Resumen

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.

Idioma originalInglés
Páginas (desde-hasta)269-276
Número de páginas8
PublicaciónAstronomy and Astrophysics
Volumen460
N.º1
DOI
EstadoPublicada - 2006

Áreas temáticas de ASJC Scopus

  • Astronomía y astrofísica
  • Ciencias planetarias y espacial

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