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182 single-lined hot subdwarf stars are identified by using spectra from thesixth and seventh data release (DR6 and DR7) of the Large Sky Area Multi-ObjectFibre Spectroscopic Telescope (LAMOST) survey. We classified all the hotsubdwarf stars using a canonical classification scheme, and got 89 sdB, 37sdOB, 26 sdO, 24 He-sdOB, 3 He-sdO and 3 He-sdB stars, respectively. Amongthese stars, 108 hot subdwarfs are newly discovered, while 74 stars werereported by previous catalogs. The atmospheric parameters of these stars wereobtained by fitting the hydrogen (H) and helium (He) lines with non-localthermodynamic equilibrium (non-LTE) model atmospheres. The atmosphericparameters confirm the two He sequences and the two subgroups of He-sdOB starsin our samples, which were found by previous studies in the T eff -log(nHe/nH)diagram. Our results demonstrate different origins of field hot subdwarf starsand extreme horizontal branch (EHB) stars in globular clusters (GCs), andprovide strict observational limits on the formation and evolution models ofthe different sub-types of these evolved objects. Based on the results, weevaluated the completeness of the Geier et al. (2019) catalog. We found thefraction of hot subdwarf stars is between 10% and 60%, depending on thebrightness of the sample. A more accurate estimation for the hot subdwarffraction can be obtained when similar results from composite spectra willbecome available.

Hot subdwarf stars identified in Gaia DR2 with spectra of LAMOST DR6 and DR7 I. Single-lined spectra