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Star clusters: age, metallicity and extinction from integrated spectra

Published online by Cambridge University Press:  18 January 2010

Rosa M. González Delgado  and
Roberto Cid Fernandes
Rosa M. González Delgado
Affiliation:
Instituto de Astrofísica de Andalucía–CSIC, Granada, Spain
Roberto Cid Fernandes
Affiliation:
Departamento de Física, Universidade Federal de Santa Catarina, Florianopolis, Brazil
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Abstract

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Integrated optical spectra of star clusters in the Magellanic Clouds and a few Galactic globular clusters are fitted using high-resolution spectral models for single stellar populations. The goal is to estimate the age, metallicity and extinction of the clusters, and evaluate the degeneracies among these parameters. Several sets of evolutionary models that were computed with recent high-spectral-resolution stellar libraries (MILES, GRANADA, STELIB), are used as inputs to the starlight code to perform the fits. The comparison of the results derived from this method and previous estimates available in the literature allow us to evaluate the pros and cons of each set of models to determine star cluster properties. In addition, we quantify the uncertainties associated with the age, metallicity and extinction determinations resulting from variance in the ingredients for the analysis.

Keywords

galaxies: star clustersgalaxies: stellar contentMagellanic Clouds
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S266: Star clusters: basic galactic building blocks throughout time and space , August 2009 , pp. 403 - 406
Copyright
Copyright © International Astronomical Union 2010

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