Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985acaps...5...50x&link_type=abstract
(Acta Astrophysica Sinica, vol. 5, no. 1, 1985, p. 50-58) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 9, June 1985
Astronomy and Astrophysics
Astrophysics
Gravitational Collapse, Stellar Models, Supernovae, Atmospheric Models, Electron Capture, Electron Density (Concentration), Neutrinos, Particle Precipitation, Shock Wave Propagation
Scientific paper
A numerical model of the collapse stage of a Type-II supernova with a mass of 15 solar mass is developed. The model takes into account the effects of inverse reactions and the neutron-proton mass difference in calculations of the neutron-electron capture rate. The maximum inward velocity of the model was 3.06 x 10 to the 9th cm/s, and the corresponding mass was 0.76 solar mass. It is shown that the larger values are more favorable to the propagation of shock waves following the rebounce and the triggering of a Type-II supernova explosion. A leakage model and an equilibrium diffusion model were used to describe neutrino transport in a thick and a thin atmosphere respectively. A gray atmosphere model was used to assess the effect of neutrino transport precipitation on collapse. It is found that the effect is actually small, and the energy precipitation may be no more than 10 to the -5th times greater than neutrino loss. Momentum precipitation in the model was no more than 10 to the -6th times greater than the gravitational acceleration. The core collapse velocity curves is presented in graphic form.
Ge Yun-Zao
Li Zhi-Wei
Xu Cenke
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