What happens to the Fe core when it contracts?
White dwarf -- mostly composed of degenerate electron gas and Fe nuclei
When density gets to 10E11 g/cm3, nuclei dissolve creating relativistic electron gas
Most of neutron star is a superfluid composed of neutrons, protons and electrons with near-zero viscosity and is superconducting
Escape velocity is about one-third the speed of light ... star will accrete matter from gas or binary companion and some kinetic energy goes into radiation: X-Rays.
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