Chapter_15_General_Stars_summary - P 2 = 4 π 2 a 3 G M 1 M...

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Chapter Summaries Chapter 15: Surveying the Stars (general properties of stars) 1. General Properties of Stars from the Sun Chapter Stars are ionized gas Stars are hot, bright, and massive Brightness of star depends on distance from Earth (us) and energy output Luminosity Apparent brightness Absolute magnitude + distance Luminosity Hipparchus (range in naked-eye magnitude 1 to 6) Parallex (parsec) determines distance to the star Color and temperature (black body radiation) Spectral Type and temperature (OBAFGKM) “the Calculators” Determining stellar mass Visual binary Eclipsing binary Spectrascopic binary Newton’s version of Kepler’s 3rd Law :
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Unformatted text preview: P 2 = 4 π 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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