Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...149..413g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 149, no. 2, Aug. 1985, p. 413-422.
Astronomy and Astrophysics
Astrophysics
25
Carbon, Nuclear Fusion, Oxygen, Pair Production, Stellar Cores, Stellar Evolution, Stellar Rotation, Dynamic Stability, Electron-Positron Pairs, Equations Of State, Momentum, Neutrinos, Stellar Structure, Supermassive Stars, Supernovae
Scientific paper
The final evolution of rotating carbon-oxygen cores which encounter the electron-positron pair instability is investigated. Equilibrium, stability and dynamics of these cores is described in terms of Maclaurin spheroids. This treatment makes it possible to determine the marginally unstable configurations which later on are used as the initial models for nonspherical collapse calculations. A phase diagram is presented showing the regimes of stability, explosion, and collapse as a function of angular momentum and mass. A study is made of the effect of rotation in combination with explosive nuclear burning and energy dissipation by neutrinos on the dynamical evolution of the C/O-cores. The physical conditions are identified under which these effects result in an extension of the mass range for pair creation supernovae.
El Eid Mounib F.
Fricke Klaus J.
Glatzel Wolfgang
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