Tuesday, October 20, 2009

H-R Diagram

The Hertzsprung-Russell (H-R) diagram shows the relationship between temperature and absolute magnitude.

  • 90% of all stars are main sequence stars
  • blue stars have the highest surface temperatures
  • the brightest main-sequence stars are also the hottest.
  • the Sun is an average main sequence star, yellow in color
  • as our Sun ages it will eventually become a red giant
  • the Sun has an absolute magnitude of +5

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