Question
An H-R diagram for a globular cluster will show a horizontal branch a line of stars above the main-sequence but to the left of the subgiants and red giants.
Which of the following statements about these horizontal branch stars is true?
Statements:
a. No correct answer
b. They have inert (non-burning) carbon cores.
c. Their sole source of energy is hydrogen shell burning.
d. They generate energy through both hydrogen fusion and helium fusion. (Correct Answer)
e. In a particular star cluster, all horizontal branch stars have the same spectral type.
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