What is a sun sized star that has converted the hydrogen in its core to helium?

A sun-sized star that has converted the hydrogen in its core to helium is typically in the "main sequence" phase of its life cycle. Once it exhausts the hydrogen fuel in its core, it will enter the "red giant" phase, during which it expands and cools. In this stage, helium fusion begins, allowing the star to create heavier elements. This marks a significant transition in its evolution, leading eventually to its end stages, such as shedding its outer layers or becoming a white dwarf.