Helium fusion begins in the core of a low-mass star after the helium flash. Where did this helium come from?
A)It was part of the original protostar, but before the helium flash, the temperature was not high enough for helium fusion.
B)It was produced by hydrogen fusion during the main-sequence phase.
C)The star acquired it from meteor and comet impacts during the main-sequence phase.
D)It was produced by the helium flash.

Question

Quizplus · Accepted Answer

The helium in the core of a low-mass star after the helium flash was produced by hydrogen fusion during the main-sequence phase. This is because during the main sequence, hydrogen fusion occurs in the core, producing helium as a byproduct. The helium accumulates in the core until the temperature and pressure are high enough for helium fusion to begin after the helium flash.

Helium Fusion Begins in the Core of a Low-Mass Star