Unformatted text preview: reaction the shell Helium fusion rises very sharply when temperature is hot enough. 3 He -> C Helium Flash Thermostat is broken in low-mass red giant because degeneracy pressure supports core Core temperature rises rapidly when he fusion begins He fusion rate skyrockets until thermal pressure takes over and expands core again Helium burning stars neither shrink nor grow because core thermostat is temporarily fixed The red giant shrinks and become less luminous after helium fusion begins He burning stars are found in a horizontal branch on HR diagram...
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- Spring '08
- 2m, 8m, Helium Flash Thermostat, shell Helium fusion