The LAMOST stellar parameter pipeline at Peking University – lsp3 Article Swipe
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· 2015
· Open Access
·
· DOI: https://doi.org/10.1093/mnras/stu2692
· OA: W2028070372
We introduce the LAMOST Stellar Parameter Pipeline at Peking University ---\nLSP3, developed and implemented for the determinations of radial velocity\n$V_{\\rm r}$ and stellar atmospheric parameters (effective temperature $T_{\\rm\neff}$, surface gravity log\\,$g$, metallicity [Fe/H]) for the LAMOST\nSpectroscopic Survey of the Galactic Anti-center (LSS-GAC). We describe the\nalgorithms of LSP3 and examine the accuracy of parameters yielded by it. The\nprecision and accuracy of parameters yielded are investigated by comparing\nresults of multi-epoch observations and of candidate members of open and\nglobular clusters, with photometric calibration, as well as with independent\ndeterminations available from a number of external databases, including the\nPASTEL archive, the APOGEE, SDSS and RAVE surveys, as well as those released in\nthe LAMOST DR1. The uncertainties of LSP3 parameters are characterized and\nquantified as a function of the spectral signal-to-noise ratio (SNR) and\nstellar atmospheric parameters. We conclude that the current implementation of\nLSP3 has achieved an accuracy of 5.0\\,km\\,s$^{-1}$, 150\\,K, 0.25\\,dex,\n0.15\\,dex for the radial velocity, effective temperature, surface gravity and\nmetallicity, respectively, for LSS-GAC spectra of FGK stars of SNRs per pixel\nhigher than 10. The LSP3 has been applied to over a million LSS-GAC spectra\ncollected hitherto. Stellar parameters yielded by the LSP3 will be released to\nthe general public following the data policy of LAMOST, together with estimates\nof the interstellar extinction $E(B-V)$ and stellar distances, deduced by\ncombining spectroscopic and multi-band photometric measurements using a variety\nof techniques.\n
