Stars: Properties and Classification

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The Hertzsprung-Russell Diagram The Main Sequence - all main sequence stars fuse H into He in their cores - this is the defining characteristic of a main sequence star. - more massive stars are more luminous <strong>and</strong> hotter: L=4πR 2 σT 4
The Hertzsprung-Russell Diagram L=4πR 2 σT 4 Red Giants - Red Giant stars are very large, cool <strong>and</strong> quite bright. Ex. Betelgeuse is 100,000 times more luminous than the Sun but is only 3,500K on the surface. Its radius is 1,000 times that of the Sun.
Page 1 and 2: Stars: Properties and Classificatio
Page 3 and 4: Assigned Reading n Units 52.1-2-3,
Page 5 and 6: n There are four principal characte
Page 7 and 8: 1 (AU) D (in Parsecs) = P (in arcse
Page 9 and 10: Parallax would be easier to measure
Page 11 and 12: Luminosity Luminosity is the total
Page 14 and 15: The Sun radiates an enormous amount
Page 16 and 17: Brightness is different from Lumino
Page 18: Surface Temperature
Page 21 and 22: Spectral Types For historical reaso
Page 23 and 24: Use Temperature and Luminosity to M
Page 25 and 26: L=4πR 2 σT 4 Survey Question Supp
Page 27 and 28: Stellar Properties Survey Questions
Page 29 and 30: Mass: How do you measure the mass o
Page 31 and 32: Binary Stars: use the Generalized K
Page 33 and 34: Summary n There are four principal
Page 35 and 36: Nuclear fusion rate rises dramatica
Page 37 and 38: Thus… n More massive = n Higher T
Page 39: The Hertzsprung-Russell Diagram
Page 43 and 44: The Hertzsprung-Russell Diagram Whi

Stars: Properties and Classification

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