PHYS 182 Lecture Notes - Lecture 4: Dwarf Galaxy, Large Magellanic Cloud, Sn 1987A
24 Jan 2018
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Document Summary
Proton proton chain occurs in high mass stars. Just the idea that 4 hydrogens form a helium. Also have a cno cycle (on main sequence) Proton mergers with carbon and forms a nitrogen. Nitrogen decays into an isotope of carbon. Proton merges with this carbon and you get oxygen. Proton merges with nitrogen and you form a helium and carbon. High mass elements are used as a catalyst to form helium and speed up reaction. Occur at a must faster rate repulsive force) High temperature and density required to produce helium this way (overcome. Cno: more efficient reaction than proton-proton chain and produces high luminosity. End up producing more overall energy with the fusion in cno cycle. First post main sequence stages are the same as low mass stars. Hydrogen shell of hydrogen burning surrounding inert helium core. These phases occur much faster in high mass stars than in low mass stars.
