AST-1002 Lecture Notes - Lecture 10: Caroline Herschel, Henrietta Swan Leavitt, Harlow Shapley
Document Summary
4/7/2016: black holes, when looking for black holes, we look for x rays, how to find black hole candidate: b. i. Binary system that emits x-rays; presence of a compact object b. ii. X-ray bursters: accrete material from surface, heats up to helium flash, cools down b. iii. From binary orbit, if mass is > 3m, companion is almost certainly a black hole b. iv. Temporary brightening of neutron star is difference. b. iv. 2. In black hole, vanishes with no detectable burst of energy: black holes have no hair c. i. Means that black holes" matter cannot be distinguished c. iii. Theorized that black holes will eventually evaporate c. iv. Change in energy x change in time c. iv. 2. Matter and anti-matter, pop into existence, collide and disappear c. iv. 2. b. Separation of particle pairs causes black hole to evaporate (hawking radiation) The milky way galaxy: 100 billion stars, 25,000 pc across, sun is 2/3 of the way from the center, highly flattened system d. i.
