When a high mass main sequence star runs out of both hydrogen and helium in its core the core begins to fuse
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In stars of 8 solar masses or less there is insufficient gravitational energy to generate the temperatures required. No more core fusion can thus take place. The core contraction does however generate sufficient heat for the surrounding layer of helium to start fusing, that is helium shell burning starts.
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In stars of 8 solar masses or less there is insufficient gravitational energy to generate the temperatures required. No more core fusion can thus take place. The core contraction does however generate sufficient heat for the surrounding layer of helium to start fusing, that is helium shell burning starts.
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