Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relative Flux Calibration of the LAMOST Spectroscopic Survey of the
  Galactic Anti-center   We have developed and implemented an iterative algorithm of flux calibration
for the LAMOST Spectroscopic Survey of the Galactic anti-center (LSS-GAC). For
a given LSS-GAC plate, the spectra are first processed with a set of nominal
spectral response curves (SRCs) and used to derive initial stellar atmospheric
parameters (effective temperature $T_{\rm eff}$, surface gravity log\,$g$ and
metallicity [Fe/H]) as well as dust reddening $E(B-V)$ of all targeted stars.
For each of the sixteen spectrographs, several F-type stars of good
signal-to-noise ratios (SNRs) are then selected as flux standard stars for
further, iterative spectral flux calibration. Comparison of spectrophotometric
colours, deduced from the flux-calibrated spectra, with the photometric
measurements yields average differences of 0.02$\pm$0.07 and
$-$0.04$\pm$0.09\,mag for the $(g-r)$ and $(g-i)$, respectively. The relatively
large negative offset in $(g-i)$ is due to the fact that we have opted not to
correct for the telluric bands, most notably the atmospheric A-band in the
wavelength range of $i$-band. Comparison of LSS-GAC multi-epoch observations of
duplicate targets indicates that the algorithm has achieved an accuracy of
about 10 per cent in relative flux calibration for the wavelength range 4000 --
9000\,\AA. The shapes of SRC deduced for the individual LAMOST spectrographs
are found to vary by up to 30 per cent for a given night, and larger for
different nights, indicating that the derivation of SRCs for the individual
plates is essential in order to achieve accurate flux calibration for the
LAMOST spectra.

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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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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: cs
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The categories of this paper are: plasm-ph