Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectral Energy Distributions and Age Estimates of 78 Star Clusters in
  M33   In this third paper of our series, we present CCD spectrophotometry of 78
star clusters that were detected by Chandar, Bianchi, & Ford in the nearby
spiral galaxy M33. CCD images of M33 were obtained as a part of the BATC Color
Survey of the sky in 13 intermediate-band filters from 3800 to 10000{\AA}. By
aperture photometry, we obtain the spectral energy distributions of these 78
star clusters. As Chandar, Bianchi, & Ford did, we estimate the ages of our
sample clusters by comparing the photometry of each object with theoretical
stellar population synthesis models for different values of metallicity. We
find that the sample clusters formed continuously in M33 from $\sim
3\times10^6$ -- $10^{10}$ years. This conclusion is consistent with Chandar,
Bianchi, & Ford. The results also show that, there are two peaks in cluster
formation, at $\sim 8\times10^6$ and $\sim 10^9$ years in these clusters.

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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-th
3
The categories of this paper are: physics
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The categories of this paper are: bayes-an
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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: supr-con