ASTR 209 Lecture Notes - Lecture 13: White Dwarf, Eaves, Large Magellanic Cloud

• School: University of Calgary
• Department: Astronomy
• Course: ASTR 209
• Professor: J.Still

Document Summary

Spectral type o5, o5 is the middle, hydrogen absorption lines, a little too hot for strong hydrogen lines. Most hydrogen is ionized, cannot contribute to lines. The earliest spectral type you find in practice is. At this stage the pressure is too high. The core collapses in a fraction of a second and electrons are forced to merge with protons to form neutrons. The supernova explosion mystery: explosion starts with a fast impplisin of the core of the star. We observed directly the neutrionos that were created in supernova: were not clear how this implosion is reversed, the implosion of the core stops at about 10km. Because at this point, the neutrinos become degenerate. Supernova explosion: somehow the implosion is turned into an explosion. Outer layers of the star are ejected into space with a velocity of 10 000 kilometers per second: the explosion shines as bright as 10 billions suns.