M DWARF CATALOG OF THE LAMOST PILOT SURVEY

We present a spectroscopic catalog of 58,360 Mdwarfs from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope pilot survey. For each spectrum in the catalog, spectral subtype, radial velocity, H alpha equivalent width, a number of prominent molecular band indices, and the metal-sensitive parameter xi are provided. We use the Sloan Digital Sky Survey Data Release 7 Spectroscopic M dwarf catalog to verify the precision of our methods of classifying the spectral types and measuring the radial velocities. The magnetic activity properties of M dwarfs are also traced by H alpha emission lines. The molecular band indices included in this catalog are sensitive to temperature or metallicity, and can be used for further study of the physical properties of M dwarfs.