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A new, fully dynamic and self-consistent radiation hydrodynamics code,suitable for the calculation of supernovae light curves and continuum spectra,is described. It is a multigroup (frequency-dependent) code and includes allimportant $O(v/c)$ effects. It is applied to the model W7 of Nomoto,Thielemann, \& Yokoi (1984) for supernovae of type Ia. Radioactive energydeposition is incorporated through use of tables based upon Monte Carloresults. Effects of line opacity (both static or line blanketing and expansionor line blocking) are neglected, although these may prove to be important. Atmaximum light, models based upon different treatments of the opacity lead tovalues for $M_{B,max}$ in the range of -19.0 to -19.4. This range falls betweenthe values for observed supernova claimed by Leibundgut \& Tammann (1990) andby Pierce, Ressler, \& Shure (1992).Comment: 24 pages, LaTeX with prepended aasms.sty, figures (compressed  postscript) available upon request at pgs@physun.physics.mcmaster.c

A new radiation hydrodynamics code and application to the calculation of type IA supernovae light curves and continuum spectra