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Unformatted text preview: 1 Today’s Lecture: purpose & goals The Properties of Stars: a Ce l e s t i a l Cen s u s AST 1002 Planets, Stars and Galaxies 1) Review Measuring the Properties of Stars 2) Range of Stellar Properties stellar Temperature stellar Composition stellar Distance stellar Luminosity stellar Size stellar Mass 3) H-R diagrams 4) Mass-Luminosity Relation 5) Intro to Stellar Evolution We study stars by observing their light! 1) What we learn about stars from their light: measure stars’ Temperature (Blackbody radiation, Wien’s law) measure stars’ Composition (atomic spectra) H , He , traces of other elements measure stars’ Distance (parallax) Review Analyzing Starlight Wien’s Law: T (K) = 2,900,000/ λ max (nm) or λ max (nm) = 2,900,000/T (K) Stefan-Boltzmann Law: L = 4 π R 2 . σ T 4 ecs) angle (arcs 1 arsecs) distance (p = We study stars by observing their light!...
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