SED, Age and Metallicity of Star Clusters in M33

Details SED, Age and Metallicity of Star Clusters in M33 SED, Age and Metallicity of Star Clusters in M33

2001-06-27

arxiv.org/abs/astro-ph/0106487v1

Astronomy and Astrophysics

Astrophysics

29 pages, 7 figures, will appear in the October 2001 issue of AJ

Scientific paper

In this paper we present CCD spectrophotometry of the star clusters that were detected by Chandar, Bianchi, & Ford in the nearby spiral galaxy M33, using the images obtained with the Beijing Astronomical Observatory 60/90 cm Schmidt Telescope in 13 intermediate-band filters from 3800 to 10000{\AA}. The observations cover the whole area of M33 with a total integration of 32.75 hours from September 23, 1995 to August 28, 2000. This provides a multi-color map of M33 in pixels of $1.7'' \times 1.7''$. By aperture photometry, we obtain the spetral energy distributions (SEDs) of these star clusters. Using theoretical stellar population synthesis models, we also obtain the distributions of age and metallicity of of these star clusters. These clusters formed continuously from $\sim 3\times10^6$ -- $10^{10}$ years, and have a large span of metallicity from ${\rm {Z}=0.0004}$ to ${\rm {Z}=0.05}$.

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