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T 2.9 106 K nm max 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 Fusion begins The Ring Nebula Evolution of a high mass star
