Issue |
A&A
Volume 413, Number 2, January II 2004
|
|
---|---|---|
Page(s) | 563 - 570 | |
Section | Galactic structure, stellar clusters, and populations | |
DOI | https://doi.org/10.1051/0004-6361:20031556 | |
Published online | 18 December 2003 |
Metallicity estimates for old star clusters in M 33
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China
Corresponding author: Jun Ma, majun@vega.bac.pku.edu.cn
Received:
18
February
2003
Accepted:
7
August
2003
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 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. ([CITE], [CITE]a,b,c),
we estimate the metallicities of 31 old star clusters in the nearby spiral galaxy M 33, 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 M 33 do not vary with
deprojected radial position.
Key words: galaxies: individual: M 33 / galaxies: evolution / galaxies: star clusters
© ESO, 2004
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