Metallicity Estimates for Old Star Clusters in M33

Details Metallicity Estimates for Old Star Clusters in M33 Metallicity Estimates for Old Star Clusters in M33

2005-03-29

arxiv.org/abs/astro-ph/0503615v1

Astron.Astrophys. 413 (2004) 563-570

Astronomy and Astrophysics

Astrophysics

Accepted for Publication in A&A, 13 pages, 7 figures (1 figure of jpg)

Scientific paper

10.1051/0004-6361:20031556

Using the theoretical stellar population synthesis models of BC96, Kong et al. (2003) showed that some BATC colors and color indices could be used to disentangle the age and metallicity effect. They found that there is a very good relation between the flux ratio of L_{8510}/L_{9170} and the metallicity for stellar populations older than 1 Gyr. In this paper, based on the Kong et al. results and on the multicolor spectrophotometry of Ma et al. (2001, 2002a,b,c), we estimate the metallicities of 31 old star clusters in the nearby spiral galaxy M33, 23 of which are ``true'' globular clusters. The results show that most of these old clusters are metal poor. We also find that the ages and metal abundance for these old star clusters of M33 do not vary with deprojected radial position.

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