Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Survey of Eclipsing Binary Stars in the Eastern Spiral Arm of M31   Results of an archival survey are presented using B-band imaging of the
eastern spiral arm of M31. Focusing on the eclipsing binary star population, a
matched-filter technique has been used to identify 280 binary systems. Of
these, 127 systems (98 of which are newly discovered) have sufficient phase
coverage to allow accurate orbital periods to be determined. At least nine of
these binaries are detached systems which could, in principle, be used for
distance determination. The light curves of the detached and other selected
systems are presented along with a discussion of some of the more interesting
binaries. The impact of unresolved stellar blends on these lightcurves is
considered.

18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom