What happens immediately in the self-regulating mechanism if a star temporarily generates too much energy?

Answer

The star expands, causing the core temperature to lower and slow down fusion.

Overproduction of energy causes expansion, which lowers the core temperature. This lower temperature, in turn, slows down the rate of nuclear fusion reactions, restoring balance.

What happens immediately in the self-regulating mechanism if a star temporarily generates too much energy?
stabilitygravitystarastrophysicspressure