Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246..955l&link_type=abstract
Astrophysical Journal, Part 1, vol. 246, June 15, 1981, p. 955-965.
Astronomy and Astrophysics
Astrophysics
31
Gravitational Collapse, Leptons, Shock Wave Propagation, Stellar Cores, Stellar Gravitation, Particle Trajectories, Stellar Mass Ejection, Taylor Instability, Thermodynamic Equilibrium, Thermodynamic Properties
Scientific paper
The problem of Rayleigh-Taylor overturn in stellar collapse is examined from a thermodynamic point of view. The implications that recent developments on the equation of state have for convective instability are considered. At sufficiently high entropies, it is found that leptonic gradients alone cannot give instability. The characteristics of shocks in the infalling envelope are examined. It is found that for typical shock strengths the entropy generated is sufficiently high to prevent large-scale overturn of the entire core. In addition, the condition of beta equilibrium at lower densities and entropies insures a stable lepton gradient. Thus, it is found that convective overturn powered solely by lepton gradients must be limited to the dense and shocked mantle of the collapsed core. This suggests that a stellar explosion due to lepton-driven overturn may not be feasible.
Lattimer James M.
Mazurek T. J.
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