Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Catalog of New M33 Star Clusters Based on the HST/WFPC2 Images   We present the result of a survey for star clusters in M33 using the
HST/WFPC2 archive images. We have found 104 star clusters, including 32 new
ones, in the images of 24 fields that were not included in the previous
studies. Combining these with previous data in the literature, we increase the
number of M33 star clusters found in the HST images to 242. We have derived BVI
integrated photometry of these star clusters from the CCD images taken with
CFH12k mosaic camera at CFHT. Integrated color-magnitude diagrams of the M33
star clusters are found to be similar in general to those of star clusters in
the Large Magellanic Cloud, except that M33 has a much lower fraction of blue
star clusters. We find 29 red star clusters with 0.5 <= (B-V)_0 <= 1.1 and 0.7
<=(V-I)_0 <= 1.2, which are old globular cluster candidates. We divide the
cluster sample into three groups according to their (B-V)_0 color: blue star
clusters with (B-V)_0 <= 0.3, intermediate color star clusters with 0.3 <
(B-V)_0 <0.5, and red star clusters with (B-V)_0 >= 0.5. Most of the new
clusters in M33 are located along the sequence that is consistent with the
theoretical evolutionary path for Z=0.004, Y=0.24 in the (B-V)_0--(V-I)_0
diagram, while a few of them are in the redder side in the (V-I)_0 color. The
red clusters are found relatively more in the outer region of M33 than the blue
and intermediate color clusters, and that many of the blue stars are located in
the HII regions. The luminosity function for the blue star clusters shows a
peak at Mv ~ -7.3 mag, while that for the intermediate color star cluster shows
a peak at the fainter magnitude Mv ~ -6.3 mag. The luminosity function for the
red star clusters shows also a peak at Mv ~ -6.8 mag, although the number of
the clusters is small.

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The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
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The categories of this paper are: q-alg
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The categories of this paper are: stat
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin
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The categories of this paper are: atom-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: cs
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: ao-sci