OPTICAL LIGHT CURVES OF THE TYPE IA SUPERNOVAE SN 1990N AND SN 1991T

We present UBVRI light curves for the bright Type Ia supernovae SN 199 0N in NGC 4639 and SN 1991T in NGC 4527, based on photometry gathered in the course of the Calan/Tololo supernova program. Both objects have well-sampled light curves starting several days before maximum light and spanning well through the exponential tail. These data supersede t he preliminary photometry published by Leibundgut ct al, and Phillips et al, The host galaxies for these supernovae have (or will have) accu rate distances based on the Cepheid period-luminosity relationship. Th e photometric data in this paper provide template curves for the study of the general population of Type Ia supernovae and accurate photomet ric indices, needed for the Cepheid-supernova distance scale.