A Star Ascending the Red Giant Branch for the Second

question 63

Multiple Choice

A star ascending the red giant branch for the second time in the asymptotic giant branch phase will have:

• A) no nuclear reactions in the core, but a helium-fusion shell outside the core, which itself is surrounded by a shell of hydrogen.
• B) no fusion reactions; the star has used up all its nuclear fuel.
• C) hydrogen-fusion reactions occurring in the core.
• D) no nuclear reactions occurring in the core but hydrogen fusion in a shell outside the core.

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