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Unformatted text preview: P 2 = 4 2 a 3 G ( M 1 + M 2 ) Color and Spectral type reflect the temperature of star 2. Patterns Among Stars Herzsprung-Russell Diagram Plot of temperature vs Luminosity of stars Main sequence Plot mass vs luminosity --- lum is directly proportional to mass 4 Giants White Dwarfs Mass of star determines life time : big bright stars have short lives small dim stars have long lives Pulsating Variable Stars Cephied stars RR Lyrae Period of pulsation is directly proportional to luminosity provides distances to galaxies 3. Star Clusters Two types of clusters: Open cluster Globular cluster...
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