I would call this the “Helium Flash” after a real life phenomenon.



Consider a Sun-like star, that has exhausted its central hydrogen and contains an inert core composed of helium. This core compresses and gets hotter until helium fusion starts. However, since the core is so dense it cannot expand to counter the excess energy produced by helium burning (Normally, a stellar core would expand if energy production increases), a runaway fusion called a Helium flash, that during the few seconds it lasts produces so much energy as an entire galaxy, ensues, ending when the core re-expands, cools down, and fuses helium stably. (However, since the energy produced in the flash is entirely used to expand the core and the star's outer layers hold it, its effects are not visible in the outside) Also, massive stars do not experience it as helium burning begins before their cores become so dense.