Models for Initially Homogeneous Carbon-Rich Stars

Stellar models between 0.75 and 1.45 M0, initially consisting of 50 percent 12C and 50 percent 160 (by mass), have been constructed. The evolutionary computations included the most recent nuclear reaction rates and neutrino loss rates (excluding bremsstrahlung neutrinos), screening corrections to the reaction rates, and Coulomb corrections to the thermodynamic properties of the nuclei. The minimum mass for significant carbon-burning is near 1.03 M0. Models with masses between 1.03 M0 and 1.15 M0 initially ignite carbon in an intermediate convective shell, while more massive models initially ignite carbon in a convective core. In models with masses greater than 1.39 Mc, oxygen shell-burning begins prior to the onset of inverse fl-decays at the stellar center. Subject headings: interiors, stellar stellar evolution