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What event causes a star to change from a red giant to a horizontal branch star?
Wiki User
∙ 13y ago
Stars leave the red giant branch when the temperature of the core reaches about
100 millionoK and helium fusion in the core begins. The star is now on the horizontal branch.
In smaller stars - this is known as helium flash. [See related question]
Wiki User
∙ 13y ago
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