Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: CURious Variables Experiment (CURVE). CCD Photometry and Variable Stars
  in the field of open cluster NGC 637   We present VI photometry for the open cluster NGC 637 which is located in the
Cassiopeia region. Morphology of cluster color-magnitude diagram indicates that
it is a young object with age of a few million years. The apparent distance
modulus of the cluster is 13.9<(m-M)_V<14.3, while reddening is
0.69<E(V-I)<0.73. We estimated the heliocentric distance as 2.6<d<3.3 kpc. We
also report the identification of two variable stars in NGC 637. One of the
variables is a non-radial pulsating beta Cep-type star. Other one is a likely
ellipsoidal variable, however its pulsating nature can not be excluded.

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The categories of this paper are: adap-org
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The categories of this paper are: supr-con
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
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The categories of this paper are: econ
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The categories of this paper are: cs
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: physics
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: stat
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The categories of this paper are: plasm-ph