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Detailed abundance analysis of the bulge globular cluster NGC 6553

Published online by Cambridge University Press:  23 December 2005

A. Alves-Brito ,
B. Barbuy ,
M. Zoccali ,
D. Minniti ,
S. Ortolani ,
V. Hill ,
A. Renzini ,
L. Pasquini  and
E. Bica
A. Alves-Brito
Affiliation:
IAG-USP, Rua do Matão 1226, São Paulo, 05508-900, Brazil email: [email protected]
B. Barbuy
Affiliation:
IAG-USP, Rua do Matão 1226, São Paulo, 05508-900, Brazil email: [email protected]
M. Zoccali
Affiliation:
Universidad Catolica de Chile, Casilla 306, Santiago 22, Chile
D. Minniti
Affiliation:
Universidad Catolica de Chile, Casilla 306, Santiago 22, Chile
S. Ortolani
Affiliation:
Università di Padova, Vicolo dell'Osservatorio 2, 35122 Padova, Italy
V. Hill
Affiliation:
Observatoire de Paris-Meudon, 92195 Meudon Cedex, France
A. Renzini
Affiliation:
ESO, Karl Schwarzschild Strasse 2, 85748 Garching bei München, Germany
L. Pasquini
Affiliation:
ESO, Karl Schwarzschild Strasse 2, 85748 Garching bei München, Germany
E. Bica
Affiliation:
Universidade Federal do Rio Grande do Sul, CP 15051, Porto Alegre 91501-970, Brazil
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Abstract

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A detailed abundance analysis of four giants in the metal-rich bulge globular cluster NGC 6553 is carried out, based on optical high resolution échelle spectra obtained with UVES at the ESO VLT-UT2 Kueyen telescope. A mean radial heliocentric velocity of −1.86 km s−1 is found. Stellar parameters are derived from spectroscopic data based on Fe I and Fe II lines. Enhanced abundance ratios for the α-elements Mg and Si with respect to Ca and Ti are obtained. The odd-Z elements are typically solar. A solar value for the r-process element Eu ([Eu/Fe] = +0.05 ±0.06) was also found.

Keywords

Globular clusters:individual:NGC6553 – globular clusters:general – stars:abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S228: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution , May 2005 , pp. 327 - 328
Copyright
© 2005 International Astronomical Union