L=4?R2?T4

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• L4?R2?T4

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Spectral Type Temperature
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• LM3.5

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Stellar Evolution

• Why is the study of stellar evolution difficult?
• Stars change very little over a human lifespan,
  so it is impossible to follow a single star from
  birth to death.
• How do we attempt to overcome this difficulty?
• We observe stars at various stages of evolution,
  and can piece together a description of the
  evolution of stars in general
• Computer models provide a fast-forward look at
  the evolution of stars.
• Mass (how much fuel is available) tells us much
  about how a star will evolve!
• Stellar Evolution can be viewed as a competition
  b/t gravity and pressure.

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1 Solar Mass Star
Fusion begins
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The Ring Nebula
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Evolution of a high mass star
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