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Unformatted text preview: helium in its core What happens when a star can no longer fuse hydrogen into helium in its core? ..core shrinks and heats up Life track after main sequence Observations show that a star becomes larger, redder, and more luminosity after main seq. ..core shrinks but outer layers expand Inert He core can not support gravity, so contracts and heats up H burns in a dense hot shell around core at a very high rate...
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- Winter '09