We present template spectra of low-mass (M0-L0) dwarfs derived from over 4000 Sloan Digital Sky Survey spectra. These composite spectra are suitable for use as medium-resolution (R ~ 1800) radial velocity standards. We report mean spectral properties (molecular band-head strengths, equivalent widths) and use the templates to investigate the effects of magnetic activity and metallicity on the spectroscopic and photometric properties of low-mass stars.
John J. Bochanski, Andrew A. West, Suzanne L. Hawley, and Kevin R. Covey. "Low-Mass Dwarf Template Spectra from the Sloan Digital Sky Survey." The Astronomical Journal 133 (2): 531-544. 2007.