l=4 r 2 t 4. spectral type ~ temperature
Post on 30-Jan-2016
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max
6 nmK 109.2
λ⋅×
=T L=4R2T4
Spectral Type ~ Temperature
• L~M3.5
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.
1 Solar Mass Star
Fusionbegins
The Ring Nebula
Evolution of a high mass star
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