The LAMOST Stellar Parameter Pipeline at Peking University --- LSP3
  We introduce the LAMOST Stellar Parameter Pipeline at Peking University ---
LSP3, developed and implemented for the determinations of radial velocity
$V_{\rm r}$ and stellar atmospheric parameters (effective temperature $T_{\rm
eff}$, surface gravity log\,$g$, metallicity [Fe/H]) for the LAMOST
Spectroscopic Survey of the Galactic Anti-center (LSS-GAC). We describe the
algorithms of LSP3 and examine the accuracy of parameters yielded by it. The
precision and accuracy of parameters yielded are investigated by comparing
results of multi-epoch observations and of candidate members of open and
globular clusters, with photometric calibration, as well as with independent
determinations available from a number of external databases, including the
PASTEL archive, the APOGEE, SDSS and RAVE surveys, as well as those released in
the LAMOST DR1. The uncertainties of LSP3 parameters are characterized and
quantified as a function of the spectral signal-to-noise ratio (SNR) and
stellar atmospheric parameters. We conclude that the current implementation of
LSP3 has achieved an accuracy of 5.0\,km\,s$^{-1}$, 150\,K, 0.25\,dex,
0.15\,dex for the radial velocity, effective temperature, surface gravity and
metallicity, respectively, for LSS-GAC spectra of FGK stars of SNRs per pixel
higher than 10. The LSP3 has been applied to over a million LSS-GAC spectra
collected hitherto. Stellar parameters yielded by the LSP3 will be released to
the general public following the data policy of LAMOST, together with estimates
of the interstellar extinction $E(B-V)$ and stellar distances, deduced by
combining spectroscopic and multi-band photometric measurements using a variety
of techniques.
