Two-dimensional hydrodynamics of pre-core collapse: oxygen shell burning

摘要

By direct hydrodynamic simulation, using the piecewise parabolic method code PROMETHEUS, we study the properties of a convective oxygen-burning shill in a SN 1987A progenitor star (20 M_⊙) prior to collapse. The convection is too heterogeneous and dynamic to be well approximated by one- dimensional diffusion-like algorithms that have previously been used for this epoch. Qualitatively new phenomena are seen. The simulations are two-dimensional, with good resolution in radius and angle, and used a large( 90°) Slice centered at the equator.