Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....74..353e&link_type=abstract
Astronomy and Astrophysics, vol. 74, no. 3, May 1979, p. 353-360. Research supported by the Statens Naturvidenskabelige Forsuni
Astronomy and Astrophysics
Astrophysics
4
Gravitational Collapse, Stellar Cores, Stellar Evolution, Supernovae, Graphs (Charts), Neutrinos, Stellar Models
Scientific paper
The evolution of a stellar core is studied during its final quasi-hydrostatic contraction. The core structure and the (poorly known) properties of neurtron-rich matter are parametrized to include more plausible cases. It is found that the density-temperature trajectory of the material in the central part of the core (the core center) is insensitive to nearly all reasonable parameter variations. The central density at the onset of the dynamic phase of the collapse (when the core center begins to fall away from the rest of the star) and the fraction of the emitted neutrinos which are trapped in the collapsing core center depend quite sensitively on the properties of neutron-rich matter. It is estimated that the amount of energy (Ecm) which is imparted to the core mantle by the neutrinos which escape from the imploded core center can span a large range of values. For plausible choices of nuclear and model parameters, Ecm can be large enough to yield a supernova event.
Bond Richard J.
Epstein Irving R.
Norgaard H.
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