NATS 1745 Study Guide - Final Guide: Annie Jump Cannon, Supernova Remnant, Cecilia Payne-Gaposchkin
7 May 2017
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An object with escape velocity = the speed of light. 1783 rev"d john michell had 1st idea for such object called it a dark star" realized it would be invisible. 1916 schwarzchild solved equations for general relativity predicted the existence of an object with escape velocity = the speed of light such an object would infinitely warp spacetime. Massive stars (> 15 msun) dying as a supernova core becomes a bh. May also form a supernova remnant as well. Look for how its gravity affects its surroundings. Use the doppler shift to study a binary star system you can see one star, but its companion is invisible: study orbital motion of the visible star and deduce the mass of the invisible companion. If it is > 3 msun a bh candidate (if it is < 3 msun it would be a neutron star)
