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Unformatted text preview: 6 Hertzsprung-Russell Diagram Hertzsprung Russell 2 The Plan Are all stars the same? Why are some hotter and others cooler? What about luminosity? These and other issues are resolved by the Hertzsprung-Russell Diagram Main Sequence Luminosity Function MS stars sit on the HR diagram 10 9 yr Giants move over periods of 10 5 yr White dwarf move over 10 10 yr 3 Sun Degenerate gas pressure Homogeneous Inhomogeneous M < 0.08Mo will not burn H M>50Mo will be unstable Sun Degenerate gas pressure Homogeneous Inhomogeneous M < 0.08Mo will not burn H M>50Mo will be unstable O B A F G K M HR Diagram 4 re: HR Diagram The range in Luminosity, 10 8 :1! (Its even up to 10 14 :1 if you count the brown dwarfs!!) Max 10,000 L Sun O5 stars Min 0.0001 L Sun M5 stars What is the range in Temperature, 15:1 Max 40,000K Min 2,500K What are R max and R min ?...
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This note was uploaded on 04/05/2009 for the course ASTRO 3332 taught by Professor Houck,j during the Spring '09 term at Cornell University (Engineering School).
- Spring '09