What happens to the luminosity of a low-mass star as it passes through a helium flash?
A) The luminosity, which was increasing slowly before the helium flash, suddenly brightens by several orders of magnitude.
B) The luminosity, which was decreasing slowly before the helium flash, suddenly brightens by several orders of magnitude.
C) The helium flash affects only the core. The luminosity of the star remains unchanged for a long time after the flash.
D) The luminosity, which was rising before the helium flash, drops quickly after the helium flash.
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