Lecture 13 Notes

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University of Toronto St. George
Astronomy & Astrophysics
Stefan Mochnacki

Cliff Lau University of Toronto AST201 Lecture 13 (March 3, 2011) When a low-mass star like the Sun dies, it will become a white dwarf When a massive star goes supernova, one of three things can happen: 1. The star could just blow itself completely apart, leaving nothing 2. It can blow its outer layers, leaving only the core of neutrons a neutron star (diameters of about 10km size of Manhattan; a teaspoon of neutron star matter would have the same mass as about 25,000 CN Towers; neutron stars have powerful magnetic fields which channel material to their poles, heating them up; due to conservation of angular momentum, neutron stars can spin more than 30 timess; it appears to blink on and off as the star spins it pulses on and off so its called a pulsar) 3. The star turns into a black hole Higher density higher V escape Escape speeds from Earths s
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