NATS 1745 Lecture Notes - Lecture 17: Stellar Evolution, White Dwarf, Supernova Remnant
13 Mar 2016
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Document Summary
Nebulae historical observations: pre-telescope; after invention of telescope solving the riddle of the nebulae - huggins & spectra types of nebulae: emission (diffuse nebulae, planetary nebulae, supernova remnants) dark nebulae reflection. With the development of spectroscopy huggins saw that nebulae had emission spectra. Nebulae are components or parts of the interstellar medium . In a galaxy: there are stars: stars generates its own energy via a process of fusion deep in the interior of the star. Material between the star: inter-stellar medium (ism: composed of various atoms. Clusters of molecules into dust particles (like c {carbon}-soot, or like sand- si, o: ism can have degrees have a range of temperatures: Hot millions of degrees: nebulae are visible regions of this inter-stellar medium. Gas can be made to glow in the right circumstances. Dense areas can be seen in silhouette. Emission nebulae: 3 types --- diffuse, planetary nebulae, supernova remnants: diffuse: near hot o- type stars.
