ASTRON 100 Lecture Notes - Lecture 16: Black-Body Radiation, Main Sequence, Protostar
7 Sep 2016
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Star birth and star death part 1. Where we come from: in the beginning the big bang produces hydrogen, helium, and some lithium (the three lightest elements, elements created in the big bang are called primordial, the production of new elements is called nucleosynthesis. Vocabulary: a cloud is a collection of molecular hydrogen (h2, the term gas usually implies reservoirs of hydrogen and/or helium, dust is composed of heavier elements (carbon and silicon) and collections of larger molecules. Why do some nebulae look like doughnuts: nebulae are byproducts of previous stars. Either a star that ejected a large amount of material in its death- throws or an actual supernova. Interstellar reddening: short wavelength light scattered by dust (blue light, long wavelength light goes through (red light) Survey question: the sky is blue during the day because. The short wavelength light is scattered by dust in the atmosphere. Survey question: the red sunset is red because.
