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Red Giant (RG) stars result from low- and intermediate-mass Main Sequence stars of around 0.5-5 solar masses. After billions of years of core nuclear fusion reactions converting hydrogen (H) to helium (He) whilst on the Main Sequence, the hydrogen supply in the core is exhausted and there is nothing left to counter the effects of gravity. As the degenerate He core starts to shrink, heat is released due to the sudden compression of the layers of gas. The centre of the core collapses quickest


Epsilon Aurigae
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An example of a red star is betelguese... It's temperature is 3,000 degrees and is a supergiant star
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