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Xiang, M.-S; Liu, X.-W; Yuan, H.-B; Huo, Z.-Y; Huang, Y; Wang, C; Chen, B.-Q; Ren, J.-J; Zhang, H.-W; Tian, Z.-J; Yang, Y; Shi, J.-R; Zhao, J.-K; Li, J; Zhao, Y.-H; Cui, X.-Q; Li, G.-P; Hou, Y.-H; Zhang, Y; Zhang, W; Wang, J.-L; Wu, Y.-Z; Cao, Z.-H; Yan, H.-L; Yan, T.-S; Luo, A.-L; Zhang, H.-T; Bai, Z.-R; Yuan, H.-L; Dong, Y.-Q; Lei, Y.-J; Li, G.-W
Monthly notices of the Royal Astronomical Society, 05/2017, Volume: 467, Issue: 2Journal Article
Abstract We present the second release of value-added catalogues of the LAMOST Spectroscopic Survey of the Galactic Anticentre (LSS-GAC DR2). The catalogues present values of radial velocity Vr, atmospheric parameters – effective temperature Teff, surface gravity log g, metallicity Fe/H, α-element to iron (metal) abundance ratio α/Fe (α/M), elemental abundances C/H and N/H and absolute magnitudes MV and $M_{K_{\rm s}}$ deduced from 1.8 million spectra of 1.4 million unique stars targeted by the LSS-GAC since 2011 September until 2014 June. The catalogues also give values of interstellar reddening, distance and orbital parameters determined with a variety of techniques, as well as proper motions and multiband photometry from the far-UV to the mid-IR collected from the literature and various surveys. Accuracies of radial velocities reach 5 km s−1 for the late-type stars, and those of distance estimates range between 10 and 30 per cent, depending on the spectral signal-to-noise ratios. Precisions of Fe/H, C/H and N/H estimates reach 0.1 dex, and those of α/Fe and α/M reach 0.05 dex. The large number of stars, the contiguous sky coverage, the simple yet non-trivial target selection function and the robust estimates of stellar radial velocities and atmospheric parameters, distances and elemental abundances make the catalogues a valuable data set to study the structure and evolution of the Galaxy, especially the solar-neighbourhood and the outer disc.
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