Angular diameter and effective temperature of a sample of 15 M giants at 2.2 mu m from lunar occultation observations

High angular resolution measurements of a sample of 15 M giants at 2.2 mu m by the technique of lunar occultation are presented in this paper. We obta in angular diameters for 11 sources of which five are the first diameter me asurements. For these resolved sources we have estimated the effective temp eratures, which are consistent with previous calibrations. For the other fo ur sources we put the first upper limits on their angular sizes to be 2 mas . Two sources, namely IRC+20090 and IRC+20067, yield appreciably low temper atures, which could point to their possible Mira nature. For sources with H ipparcos parallax measurements, we have calculated the linear radii.