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Astron. Astrophys. 332, 19-24 (1998)


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Age and metallicity of star clusters in the Magellanic Clouds *

J.A. de Freitas Pacheco 1, B. Barbuy 2 and T. Idiart 1

1 Observatoire de la Côte d'Azur, B.P. 4229, F-06304 Nice Cedex 4, France
2 Universidade de São Paulo, IAG, Department de Astronomia, CP 3386, São Paulo 01060-970, Brazil

Received 3 October 1997 / Accepted 2 December 1997

Abstract

Spectral indices as defined by the Lick group (H [FORMULA], Mg2, Fe5270, Fe5335 and NaD) were measured for a sample of 14 clusters in the Magellanic Clouds. Iron and hydrogen indices, together with the integrated colours (B-V) and (V-K) for these clusters, were used to estimate their ages and metallicities, using calibrations based on single stellar population models. The resulting ages and metallicities are in agreement with ages estimated from colour-magnitude diagrams, and metallicities derived from spectroscopic analises or narrow band photometry.

Key words: Magellanic Clouds – galaxies: star clusters – galaxies: abundances

* Based on observations collected at the European Southern Observatory, La Silla, Chile and the Laboratório Nacional de Astrofísica, Pico dos Dias, Brazil

Send offprint requests to: J.A. de Freitas Pacheco

© European Southern Observatory (ESO) 1998

Online publication: March 10, 1998
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