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Published online by Cambridge University Press: 14 August 2015
Type II supernovae probably arise predominantly in stars of 8–15 M⊙ which leave neutron star remnants but accomplish little in the way of nucleosynthesis. Stars in the mass range ~ 15-70 M⊙ may either explode or collapse. Their evolution and final outcome, including their contribution to nucleosynthesis, may depend strongly on processes of mass loss. Type I supernovae probably involve a deflagrative explosion in a carbon-oxygen core surrounded by a distended helium envelope. The evolutionary origin of such a configuration is obscure.