VLT-UVES abundance analysis of four giants in NGC 6553

被引：39
作者：
Alves-Brito, A.
Barbuy, B.
Zoccali, M.
Minniti, D.
Ortolani, S.
Hill, V.
Renzini, A.
Pasquini, L.
Bica, E.
Rich, R. M.
Melendez, J.
Momany, Y.
机构：
[1] Univ Sao Paulo, IAG, BR-05508900 Sao Paulo, Brazil
[2] Catholic Univ Chile, Dept Astron & Astrophys, Santiago 22, Chile
[3] Univ Padua, Dipartimento Astron, I-35122 Padua, Italy
[4] Osserv Astron Padova, I-35122 Padua, Italy
[5] European So Observ, D-85748 Garching, Germany
[6] Univ Fed Rio Grande do Sul, Dept Astron, BR-91501970 Porto Alegre, RS, Brazil
[7] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
[8] Australian Natl Univ, Canberra, ACT 2600, Australia
来源：
ASTRONOMY & ASTROPHYSICS | 2006年 / 460卷 / 01期
关键词：
stars : abundances; globular clusters : individual : NGC 6553 Hertzsprung-Russell (HR) and C-M diagrams; galaxy : bulge; BULGE GLOBULAR-CLUSTERS; HORIZONTAL-BRANCH STARS; EFFECTIVE TEMPERATURE; OXYGEN ABUNDANCES; SYNTHETIC SPECTRA; GALACTIC BULGE; METALLICITY; PARAMETERS; PHOTOMETRY; EVOLUTION;
D O I：
10.1051/0004-6361:20065488
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 echelle spectra obtained with UVES at the ESO VLT-UT2 Kueyen telescope. Results. 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.
引用
收藏
页码：269 / U212
页数：12
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