What phase transition occurs when hydrogen fusion ignites in the shell surrounding the inert helium core?

Answer

The star inflates massively into a Red Supergiant.

When the helium core contracts and heats up the surrounding layer of unused hydrogen to its ignition temperature, fusion restarts in this shell. The energy output from this new hydrogen-burning shell is substantially more powerful than the energy previously generated by core fusion. This surge of energy pushes the outer layers of the star outward across vast astronomical distances, causing the star to transition from its previous state into the highly expanded, relatively cool-surfaced phase known as a Red Supergiant. This inflation scale for high-mass stars is significantly larger than that experienced by lower-mass stars transitioning to a Red Giant.

What phase transition occurs when hydrogen fusion ignites in the shell surrounding the inert helium core?

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