Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Empirical Template Library for FGK and Late--type A Stars Using
  LAMOST Observed Spectra   We present an empirical stellar spectra library created using spectra from
the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR5.
This library represents a uniform data set ranging from 3750 through 8500K in
effective temperature (T_eff), from -2.5 through +1.0 dex in metallicity
([Fe/H]), and from 0 to 5.0 dex in gravity (log g). The spectra in the library
have resolution R~1800, with well-calibrated fluxes and rest-framed
wavelengths. Using a large number of red stars observed by LAMOST, we generated
denser K type templates to fill in data missing from current empirical spectral
libraries, particularly the late K type. For K giants, we calibrated the
spectroscopic surface gravities against the asteroseismic surface gravities. To
verify the reliability of the parameters labeled for this library, we performed
an internal cross-validation by using a chi^2 minimization method to
interpolate parameters of each individual spectrum using the remaining spectra
in the library. We obtained precisions of 41 K, 0.11 dex, and 0.05 dex for
T_eff, log g, and [Fe/H], respectively, which means the templates are labeled
with correct stellar parameters. Through external comparisons, we confirmed
that measurements of the stellar parameters through this library can achieve
accuracies of approximately 125K in T_eff, 0.1 dex in [Fe/H] and 0.20 dex in
log g without systematic offset. This empirical library is useful for stellar
parameter measurements because it has large parameter coverage and full
wavelength coverage from 3800 to 8900A.

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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-ex
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The categories of this paper are: cs
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The categories of this paper are: hep-th
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The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: cond-mat
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The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: physics
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The categories of this paper are: dg-ga