Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: K2 observations of the pulsating subdwarf B star EQ Piscium: an sdB+dM
  binary   K2, the two-wheel mission of the Kepler space telescope, observed the
pulsating subdwarf B star EQ Psc during engineering tests in 2014 February. In
addition to a rich spectrum of g-mode pulsation frequencies, the observations
demonstrate a light variation with a period of 19.2 h and a full amplitude of
2%. We suggest that this is due to reflection from a cool companion, making
EQ\,Psc the longest-period member of some 30 binaries comprising a hot subdwarf
and a cool dwarf companion (sdB+dM), and hence useful for exploring the
common-envelope ejection mechanism in low-mass binaries.

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The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex