Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Determining the magnitudes and spectral types of the components of the
  binary Mira X Ophiuchi   Several values for the magnitudes and spectral types of the components of the
binary Mira X Ophiuchi have been published in the literature over the last
century. Analysis of new photometry and spectroscopy of the star between 2016
May and 2016 December indicates that the V magnitude of the constant star is
9.0 and its spectral type K1III. The spectral type of the Mira changed from
M6III at maximum to M7III as it faded and passed through minimum. The V
magnitude of the Mira varied between 6.47 at maximum and 9.83 at minimum, a
range of 3.36 magnitudes.

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The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
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The categories of this paper are: cmp-lg
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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: supr-con
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The categories of this paper are: funct-an
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The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
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The categories of this paper are: ao-sci