ASTRO-110 Chapter Notes - Chapter 1: Type Ii Supernova, Rotating Magnetic Field, Neutron Star
Document Summary
White dwarf novae: luminosity 100,000 times sun, lasts only a few weeks. Fusion explosion blasts away hydrogen shell, process begins again *always binary. Type ii (type ib, ic vary a lot stars that produce them have different compositions and masses sometimes black hole after explosion. Type ia only occurs when wd just passes limit *all produce nearly the same light curve and peak luminosity: even brighter than cepheid variables, can be used to estimate distances. Produced when high mass stars die in type ii supernova explosion. Gravity is so strong we have to use einstein"s theory of general relativity. Even light is affected uses up to 15% of its energy to escape the gravity. Seen as gravitational redshift in light"s wavelength (e=hf) Jocelyn bell: 1967, observed radio pulse with precise period between pulses in constellations cygnus. Pulsars: first neutron star seen when this was discovered)
