Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Metallicity Calibration and Photometric Parallax Estimation: I. UBV
  photometry   We present metallicity and photometric parallax calibrations for the F and G
type dwarfs with photometric, astrometric and spectroscopic data. The sample
consists of 168 dwarf stars covering the colour, iron abundance and absolute
magnitude intervals $0.30<(B-V)_0<0.68$ mag, $-2.0<[Fe/H]<0.4$ dex and
$3.4<M_V<6.0$ mag, respectively. The means and standard deviations of the
metallicity and absolute magnitude residuals are small, i.e.
$\langle\Delta[Fe/H]_{res}\rangle=0$ and $\sigma=0.134$ dex, and $\langle\Delta
(M_V)_{res}\rangle=0$ and $\sigma=0.174$ mag, respectively, which indicate
accurate metallicity and photometric parallax estimations.

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The categories of this paper are: physics
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: math
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The categories of this paper are: quant-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
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The categories of this paper are: stat
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The categories of this paper are: q-alg
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The categories of this paper are: gr-qc
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The categories of this paper are: econ