AST201H1 Lecture Notes - Lecture 10: Annie Jump Cannon

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST201H1
• Professor: Macdonald

Document Summary

7: annie cannon made sense of the vase catalog of stellar spectra, cannon realized that you could get rid of most of the special categories, keeping only a, b, Q: stars of different colour must have different: Blackbody emission how much light blackbody emits corresponds directly with its temperature. This absorption line of blue light is produced when an electron in a hydrogen atom jumps from level 2 to level 4. If you have a lot of hydrogen in second energy level, it means a lot if that wavelength of light gets absorbed if its not excited, base state - light is not gonna get absorbed. The line is weak again. in neutral gases, the electrons are bound to atoms: a plasma is a gas that is so hot the electrons break free, the nuclei are have now been ionized. Atom vs molecule: atom - single nucleus, molecule - combination of atoms.