Abstract
The observations of the narrow UV and optical emission lines of SN 1987A are modeled. The main properties of the observations are well reproduced by a shell ionized by the soft X-ray burst at the supernova shock breakout. These observations therefore provide constraints on the unobserved first hours of the supernova explosion. To explain the time evolution and fluxes of the lines, the peak radiation temperature of the supernova has to be between 4 x 10^5^ K and 8 x 10^5^ K, and the total number of ionizing photons above 100 eV ~ 10^56^ (~ 2 x 10^46^ ergs).
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