ASTR 114 Lecture Notes - Lecture 28: Solar Neutrino, Solar Cycle, Radiation Zone
10 Jan 2020
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Document Summary
Distance of far-away galaxies can be measured by using supernova explosions. Cepheid variables most appropriate for determining distances to nearby galaxies. Pattern of rising hot gas cells over photosphere = granulation. Stellar property with greatest range in values = luminosity. If a star becomes dimmer for a brief time, it"s part of an eclipsing binary star system. 5 million earths could fit in the sun. Star of sun"s diameter, but five times hotter, is 625 times more luminous than sun. Vibrations of sun reveal info about the interior structure of the sun. Spectral type, surface temperature, color all describe same basic characteristic of star. Stars w/ same temperature, one is smaller = larger star is brighter. Hotter surface temperature means emission peaks in blue part of spectrum. Binary system, less massive stars always remain further and move faster. 1. 5 magnitude sirius appears 25 times brighter than second magnitude polaris.
