Lecture 17 - b) Mass of star tells how much fuel that star...

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Lecture 17 – 11/2/10 GMT telescope will be available in the next 3 years Observable properties of stars a) Luminosity- we measure it indirectly b) Effective temperature c) Radius d) Mass- you can get this from stars orbiting around each other e) Composition- each atom leaves a fingerprint on the spectra line How long an eclipse last will give you the radius of the eclipsing object There is a lot of bias in samplings taken a) Rare objects are under or overrepresented in samples taken There’s an observed mass-luminosity relationship a) Luminosity is proportional to mass
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Unformatted text preview: b) Mass of star tells how much fuel that star has i) Lifetime is fuel supply (mass) divided by rate of consumption (luminosity), so lifetime is inversely proportional to mass The H-R Diagram a) Shows a true scatter plot where there is no true relationship between the plot b) Usually plotted as luminosity vs. temperature c) Brightness limited sample bias- over represents bright (luminous) stars d) Proper motion sample- under represents bright stars Random: 10 parsecs = 30 light years...
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This note was uploaded on 05/03/2011 for the course AST 301 taught by Professor Harvey during the Fall '07 term at University of Texas at Austin.

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