Accuracy of Lamost Dr1 Stellar Parameters

Abstract

We adopt the PASTEL catalog combined with SIMBAD radial velocities as a testing standard to validate the stellar parameters (effective temperature T eff , surface gravity log g, metallicity [Fe/H] and radial velocity V r ) from the first data release (DR1) of The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) survey. After applying data reduction and temperature constraints to the sample obtained by cross-identification, we compare the stellar parameters from DR1 and PASTEL. The results show that the DR1 results are reliable under certain conditions. We derive a dispersion of 110 K, 0.19 dex, 0.11 dex and 4.91 km s −1 in specified effective temperature ranges, for T eff , log g, [Fe/H] and V r respectively. Systematic errors are negligible except for those of V r . In addition, for stars with PASTEL [Fe/H] < −1.5, the metallicities in DR1 are systematically higher than those in PASTEL.