For an intermediate mass star Helium fusion occurs on the?

A. Main Sequence

B. Giant Branch

C. Sub-giant Branch

D. Horizontal Branch

5 Answers

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  • 2 years ago
    Favorite Answer

    I believe it to be D. - the Horizontal Branch:

    From wikipedia: https://en.wikipedia.org/wiki/Horizontal_branch

    The horizontal branch (HB) is a stage of stellar evolution that immediately follows the red giant branch in stars whose masses are similar to the Sun's. Horizontal-branch stars are powered by helium fusion in the core (via the triple-alpha process) and by hydrogen fusion (via the CNO cycle) in a shell surrounding the core. The onset of core helium fusion at the tip of the red giant branch causes substantial changes in stellar structure, resulting in an overall reduction in luminosity, some contraction of the stellar envelope, and the surface reaching higher temperatures.

  • Joseph
    Lv 7
    2 years ago

    Gee, you got three different answers. Which is the correct one? Decisions, decisions, decisions... If you only did your own homework instead of asking random strangers to give you (possibly incorrect) answers.

  • 2 years ago

    Sounds like a homework question, and I bet the answer is in your textbook.

  • 2 years ago

    C) is the correct answer, not A).

    https://en.m.wikipedia.org/wiki/Stellar_evolution

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  • Mark
    Lv 7
    2 years ago

    A, of course. Funny how I am not even taking the class, nor NEVER have taken an astronomy class, yet you are right now and don't know the answer.

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