What is the difference between a helium flash and a helium shell flash?
A) A helium flash occurs when the core becomes supported by electron-degeneracy pressure; a helium shell flash occurs when the helium shell becomes supported by electron-degeneracy pressure.
B) All stars with mass less than eight times the mass of the Sun undergo a helium flash, but only those between two and eight times the mass of the Sun undergo a helium shell flash.
C) A helium flash occurs just once; a helium shell flash can repeat many times.
D) A helium flash results in a supernova; a helium shell flash results on a planetary nebula.
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A)
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A) a shell of
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