•Neutron star (more in next chapter)
–Quantum
rules also resist neutron packing
•Densities
much higher than white dwarfs allowed
–R
~ 5 km r ~ 1014 gm/cm3 (similar to nucleus)
•M
limit uncertain, ~2 or ~3 MSun before it collapses
•
–Spins
very fast (by conservation of angular momentum)
–
–Trapped
spinning magnetic field makes it:
•Act
like a “lighthouse” beaming out E-M radiation (radio, light)
–pulsars
•Accelerates
nearby charged particles