Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9220343c&link_type=abstract
Presented at the Nuclear Astrophysics Symposium, Santa Cruz, CA, 8 Aug. 1991
Astronomy and Astrophysics
Astrophysics
Entropy, Gravitational Collapse, Neutrinos, Neutron Stars, Shock Waves, Stellar Mass Accretion, Supernovae, Cooling, Cosmic Rays, Iron, Mixing, Nickel Isotopes
Scientific paper
The mixing necessary to explain the 'Fe' line widths and possibly the observed red shifts of 1987A is explained in terms of large scale, entropy conserving, up and down flows (calculated with a smooth particle 2-D code) taking place between the neutron star and the explosion shock wave due to the gravity and neutrino deposition. Depending upon conditions of entropy and mass flux, further accretion takes place in single events, similar to relaxation oscillator, fed by the downward flows of low entropy matter. The shock, in turn, is driven by the upflow of the buoyant high entropy bubbles. Some accretion events will reach a temperature high enough to create a neutrino 'fireball,' a region hot enough, 11 Mev, so as to be partially opaque to its own (neutrino) radiation. The continuing neutrino deposition drives the explosion shock until the entropy of matter flowing downwards onto the neutron star is high enough to prevent further accretion. This process should result in a robust supernova explosion.
Benz Willy
Colgate Sterling A.
Herant M. E.
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