Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Variable Stars in Young Open Cluster NGC 2244   We present results of a UBVIc variability survey in the young open cluster
NGC 2244. In total, we found 245 variable stars. Most of them, 211 stars, are
variables with irregular variations. Furthermore, 23 periodic variables were
found. We also detected four candidates for delta Scuti stars and 7 eclipsing
binaries. Based on the mid-infrared Spitzer and WISE photometry and near
infrared JHKs 2MASS photometry we classified 104 young stellar sources among
our variables: 1 Class I object, 1 Class I/flat spectrum object, 4 flat
spectrum objects, 91 Class II objects and 7 transition disk objects. This
classification, together with r'i'H$alpha IPHAS photometry and JHK UKIDSS
photometry, were used for identification of pre-main sequence stars among
irregular and periodic variables. In this way, 97 CTTS candidates (96 irregular
and one periodic variable), 68 WTTS candidates (54 irregular and 14 periodic
variables) and 6 Herbig Ae/Be stars were found. For 223 variable stars we
calculated membership probability based on proper motions from Gaia DR2
catalogue. Majority of them, 143 stars, are cluster members with probability
greater than 70 percent. For only 36 variable stars the membership probability
is smaller than 20 percent.

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The categories of this paper are: dg-ga
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The categories of this paper are: physics
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: funct-an
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The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
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The categories of this paper are: cs