Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Eclipsing binaries in the open cluster NGC 2243 - I. Photometry   We obtained BV time series photometry for 12 variable stars from the field of
the old open cluster NGC 2243. The sample includes 3 newly identified
detached/semi-detached binaries. There are now four detached eclipsing binaries
which are likely members of the cluster. Determination of the absolute
parameters of the components would provide a valuable check on evolutionary
models of low-mass stars. An accurate ephemeris and orbital period analysis are
presented for the previously-known detached binary NV CMa. We also provide
ephemerides for 7 other periodic variables. We show that 3 contact binaries are
likely members of the cluster.

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The categories of this paper are: q-fin
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex