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We present an empirical stellar spectra library created using spectra fromthe Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR5.This library represents a uniform data set ranging from 3750 through 8500K ineffective temperature (T_eff), from -2.5 through +1.0 dex in metallicity([Fe/H]), and from 0 to 5.0 dex in gravity (log g). The spectra in the libraryhave resolution R~1800, with well-calibrated fluxes and rest-framedwavelengths. Using a large number of red stars observed by LAMOST, we generateddenser K type templates to fill in data missing from current empirical spectrallibraries, particularly the late K type. For K giants, we calibrated thespectroscopic surface gravities against the asteroseismic surface gravities. Toverify the reliability of the parameters labeled for this library, we performedan internal cross-validation by using a chi^2 minimization method tointerpolate parameters of each individual spectrum using the remaining spectrain the library. We obtained precisions of 41 K, 0.11 dex, and 0.05 dex forT_eff, log g, and [Fe/H], respectively, which means the templates are labeledwith correct stellar parameters. Through external comparisons, we confirmedthat measurements of the stellar parameters through this library can achieveaccuracies of approximately 125K in T_eff, 0.1 dex in [Fe/H] and 0.20 dex inlog g without systematic offset. This empirical library is useful for stellarparameter measurements because it has large parameter coverage and fullwavelength coverage from 3800 to 8900A.

An Empirical Template Library for FGK and Late--type A Stars Using LAMOST Observed Spectra