Characterization of <i>Kepler</i> targets based on medium-resolution LAMOST spectra analyzed with ROTFIT,

In this work we present the results of our analysis 16,300 medium-resolution LAMOST spectra late-type stars in Kepler field with aim determining stellar parameters, activity level, lithium atmospheric content, and binarity. We have used a version code ROTFIT specifically developed for these spectra. provide catalog parameters (Teff, log(g), [Fe/H]), radial velocity (RV), projected rotation (vsini). For cool (Teff < 6500 K), also calculated H-alpha LiI-6708 equivalent width, which are important indicators chromospheric evolutionary stage, respectively. derived RV 14,300 7443 stars. Literature data were quality control results. The Teff log(g) values good agreement literature. [Fe/H] appear to be overestimated metal-poor propose relation correct ROTFIT. able identify double-lined binaries, variable RVs, lithium-rich giants, emission-line objects. Based on flux, found 327 active detected line measure its width 1657 stars, both giants main sequence. Regarding latter, performed discrete age classification based abundance upper envelopes few open clusters. Among 195 Li-rich 161 reported here first time. No relationship is between abundance, allows us rule out merger scenarios as predominant explanation enrichment Li sample. fraction about 4%, higher than expected.