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The theoretical spectral evolution of a model 15~\msun\ red supergiant explosion will be presented. This should be a representative Type~II plateau (SNe~IIp) supernovae. Calculated non-LTE spectra for times ranging from the first week to greater than 200 days after explosion are compared with observations of IIp supernovae. Broad band UBVRIJHK photometry will be presented along with 50${\rm\AA}$ to 100${\rm\mu}$ spectra. Discussion will be given of the character of the relatively slow spectroscopic changes during the plateau phase, and the more rapid changes during the transition to transparency and beyond. The evidence for nucleosynthsis suggested by post plateau phase synthetic spectra will be presented and compared to observations of SNe~IIp.
This work was performed under the auspices of the U.S. Department of Energy by the Lawrence Livermore National Laboratory under contract number W-7405-ENG-48, and at UCSC was supported by the NASA Theory Program (NAGW-2525) and the National Science Foundation (AST-9115367).
