Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discovery of a pre-cataclysmic binary with unusual chromaticity of the
  eclipsed white dwarf by the GPX Survey   We report the discovery of a relatively bright eclipsing binary system, which
consists of a white dwarf and a main sequence K7 star with clear signs of
chromospheric and spot activity. The light curve of this system shows
$\sim0.2$mag ellipsoidal variability with a period of 0.297549d and a short
total eclipse of the white dwarf. Based on our analysis of the spectral and
photometric data, we estimated the parameters of the system. The K7V star is
tidally deformed but does not fill its Roche lobe (the filling factor is about
0.86). The orbital inclination is $i=73^\circ.1\pm 0^\circ.2$, the mass ratio
is $q=M_2/M_1\approx 0.88$. The parameters of the K7V star are $M_2\approx
0.64$M$_{\odot}$, $R_2=0.645\pm 0.012$R$_{\odot}$, $T_2\approx 4070$K. The
parameters of the white dwarf are $M_1\approx 0.72$M$_{\odot}$, $R_1=0.013\pm
0.003$R$_{\odot}$, $T_1=8700\pm 1100$K. Photometric observations in different
bands revealed that the maximum depth of the eclipse is in the \textit{SDSS r}
filter, which is unusual for a system of a white dwarf and a late main sequence
star. We suspect that this system is a product of the evolution of a common
envelope binary star, and that the white dwarf accretes the stellar wind from
the secondary star (the so-called low-accretion rate polar, LARP).

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The categories of this paper are: hep-th
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The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
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The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: cs