What process does the star's core undergo after its hydrogen has been converted to helium?

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<a href="http://qanda.encyclopedia.com/question/process-does-star-core-undergo-after-its-hydrogen-has-been-converted-helium-209095.html" >What process does the star's core undergo after its hydrogen has been converted to helium?</a>

After the bulk of a star's hydrogen has been converted to helium by either the proton-proton or carbon-nitrogen-oxygen process, the stellar core contracts (while the outer layers expand) until sufficiently high temperatures are reached to initiate "helium-burning" by the triple-alpha process; in this process, three helium nuclei (alpha particles) are fused to make a carbon nucleus.