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Unformatted text preview: 1 Surveying the Stars Surveying the Stars Classifying Stars Our Goals for Learning • How do we classify stars? • Why is a star’s mass its most important property? • What is a Hertzsprung–Russell diagram? Temperature Luminosity This diagram plots the Luminosity (y) as a function of Temperature (x) of many different kinds of stars. It is called a Hertzsprung- Russell Diagram . It tells us everything in one picture ! Normal hydrogen- burning stars reside on the main sequence of the H-R diagram 2 Stars with low temperature and high luminosity must have large radius (red giants), while hot stars with low luminosity must be small (white dwarfs). Large radius Small radius Temperature Luminosity H-R diagram depicts: Temperature Color Spectral Type Luminosity Radius, and indirectly: *Mass *Lifespan *Age Temperature Luminosity Which star is the hottest? A B C D Temperature Luminosity Which star is the hottest?...
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- Spring '11
- Stellar classification, main sequence, luminosity, Star cluster