ASTRON 2B03 Lecture Notes - Neutron Star, Live Fast, Die Young (Film), Escape Velocity
25 Sep 2013
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Sun"s energy result of nuclear fusion in its centre. H into he pp chain: helium individually less than 4 hydrogens -> energy off, 4. 3 milion tonnes per sec -> our sun. Over time, he builds up in the centre (helium ash). Non-burning envelope vast majority of the star. Carbon ash forms (carbon core in the centre). End product of fusion results from mass of star. Mass (relative stars) increases, results in heavier elements forming: our sun -> carbon. 2) outer layers fall off (g not too strong). Planetary nebula bad name (historically contingent). Burn h, he ( burning he )makes them large), then start forming c. Protostar > star (main sequence [h to he] g-type star) -> red giant -> Burning he now (temp higher) -> pressure larger -> larger star. Red giant brighter, but surface is cooler (red colouration) -> core is higher though (hot enough to burn he).
