Age and metallicity of star clusters in the Small Magellanic Cloud from integrated spectroscopy*
Universidade de São Paulo, Dept. de Astronomia, Rua do Matão 1226, São Paulo 05508-090, Brazil e-mail: [bdias;barbuy;idiart;kerber]@astro.iag.usp.br
2 Núcleo de Astrofísica Teórica – Universidade Cruzeiro do Sul, R. Galvão Bueno, 868, sala 105, Liberdade, 01506-000, São Paulo, Brazil e-mail: email@example.com
3 Universidade Estadual de Santa Cruz, Rodovia Ilhéus-Itabuna km16, 45662-000 Ilhéus, Bahia, Brazil
Accepted: 17 April 2010
Context. Analysis of ages and metallicities of star clusters in the Magellanic Clouds provide information for studies on the chemical evolution of the Clouds and other dwarf irregular galaxies.
Aims. The aim is to derive ages and metallicities from integrated spectra of 14 star clusters in the Small Magellanic Cloud, including a few intermediate/old age star clusters.
Methods. Making use of a full-spectrum fitting technique, we compared the integrated spectra of the sample clusters to three different sets of single stellar population models, using two fitting codes available in the literature.
Results. We derive the ages and metallicities of 9 intermediate/old age clusters, some of them previously unstudied, and 5 young clusters.
Conclusions. We point out the interest of the newly identified as intermediate/old age clusters HW1, NGC 152, Lindsay 3, Lindsay 11, and Lindsay 113. We also confirm the old ages of NGC 361, NGC 419, Kron 3, and of the very well-known oldest SMC cluster, NGC 121.
Key words: Magellanic Clouds / galaxies: dwarf / galaxies: star clusters / stars: abundances / stars: fundamental parameters
Appendix A is only available in electronic form at http://www.aanda.org
© ESO, 2010