Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photometric Investigation of the Contact Binary GU Ori with High
  Metallicity   GU Ori was observed with the 1m telescope at Yunnan Observatories in 2005. To
determine its physical properties, the Wilson-Devinney program is used. The
results reveal that GU Ori is a W-subtype shallow contact binary with a more
massive but cooler star 2. The mass of its two component stars are estimated to
be $M_1 = 0.45M_\odot$, $M_2 = 1.05M_\odot$. The O'Connell effect was reported
to be negative on the light curves observed in 2005. However, it changed to a
positive one on the light curves observed from 2011 to 2012. The mean surface
temperatures of star 2 ($T_2$) determined by the two sets of light curves were
different, which may result from stellar activities. The O - C diagram shows
that the period of GU Ori is decreasing at a rate of
$dP/dt=-6.24\times{10^{-8}}day\cdot year^{-1}$, which may be caused by mass
transfer from star 2 to star 1 with a rate of $\frac{dM_{2}}{dt}= -
2.98\times{10^{-8}}M_\odot/year$. GU Ori is a contact binary with quite high
metallicity.

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The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci