Cool Stars 14 - Submitted Abstract # 225 This version created on 05 October 2006 The Radius-Luminosity Relation from Near-Infrared Interferometry: New M Dwarf Sizes from the CHARA Array David H. Berger, University of Michigan Theo A. ten Brummelaar, Georgia State University/CHARA Douglas R. Gies, Georgia State University/CHARA Todd J. Henry, Georgia State University/CHARA Harold A. McAlister, Georgia State University/CHARA Antoine Merand, Georgia State University/CHARA Judit Sturmann, Georgia State University/CHARA Laszlo Sturmann, Georgia State University/CHARA Jason P. Aufdenberg, Embry-Riddle Aeronautical University Stephen T. Ridgway, National Optical Astronomy Observatory We present interferometric size measurements of M dwarfs obtained with the Center for High Angular Resolution Astronomy (CHARA) Array on Mount Wilson. Observations were made in the near infrared K'-band, which yielded angular diameters less than one milliarcsecond and linear radii ranging from R/R_Sun=0.25 to 0.7. By combining our data with near-IR photometry and parallaxes, we have produced an observer's radius-luminosity relationship for "single" (not in eclipsing binary systems) main sequence stars smaller than our Sun. As with low-mass stars in eclipsing binary systems, we also find that many stars are 10-15% larger than predicted. We find that a dependency on metallicity may play a larger role than previously thought such that stars become significantly larger with increasing metallicity. ----------------------------------