In asymptotic giant branch stars, the third dredge-up removes the remnants of a "shell" this element forms around the core.
In asymptotic giant branch stars, the third dredge-up removes the remnants of a "shell" this element forms around the core. This element is consumed in a reaction that generates power proportional to the square of density and roughly the fortieth power of temperature at around 100 million kelvins. A mechanism for producing this element sometimes produces fluorine as an intermediate and was proposed by (*) Bethe and Weizsäcker. In some low-mass stars, this element's runaway fusion causes its namesake "flash." This element is created via the CNO cycle and the protonproton chain, and it "burns" in the triple-alpha process. For 10 points, name this element that is created in stars by the fusion of hydrogen.
In asymptotic giant branch stars, the third dredge-up removes the remnants of a "shell" this element forms around the core.
helium [or He; or helium nucleus; or alpha particle]