Supernova explosions of massive stars - The mass range 8 to 10 solar masses

Astronomy and Astrophysics – Astrophysics

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Neutron Stars, Stellar Evolution, Stellar Models, Supermassive Stars, Supernovae, Thermonuclear Explosions, Equations Of State, Gravitational Collapse, Neutrinos, Shock Wave Propagation, Stellar Mass

Scientific paper

The final evolution of a star with an initial helium core mass of 2.2 solar masses, corresponding to a main seqeunce mass of about 9 solar masses, is investigated through core collapse and shock wave propagation. This model which is representative for stars with He-core masses between 2.0 and 2.5 solar masses (total masses of 8-10 solar masses) shows several interesting features which are not present in more massive stars, in particular, it leads to a very energetic supernova explosion with a total energy of about 2 X 10 to the 51st erg. Computations were performed with very good spatial resolution (185 mass zones for 1.38 solar masses), neutrino transport in flux limited diffusion approximation and an equation of state obtained from a temperature-dependent Hartree-Fock approach at high densities.

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