Magnetorotational collapse of an iron stellar core

Statistics – Computation

Scientific paper

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Gravitational Collapse, Heavy Elements, Magnetohydrodynamics, Metallic Stars, Stellar Evolution, Stellar Models, Equations Of State, Iron, Nuclear Fusion, Stellar Magnetic Fields, Stellar Rotation, Two Dimensional Models

Scientific paper

Four two-dimensional models of the collapse of a 15 solar mass iron stellar core that incorporate a better understanding than previously attained of the equation of state of nuclear matter, the physics of neutrino transport, and the initial configuration of the core are discussed. The model parameters are described, and computational results are presented for two rotation-only models and two rotational models with a magnetic field. The models are evaluated for their ability to provide a site for heavy element synthesis via the r-process. It is concluded that the high rotation-only model is the most promising in this respect. It evolves to a quasi-rotational equilibrium core, generating an expanding circulation pattern near the z axis that may provide an escape route for about 0.0001 solar mass of matter to escape from the core. This is consistent with a model requirement for a jet neutron-rich material to be ejected from the core.

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