How does a horizontal branch star produce energy?
A) fusion of hydrogen in the core only
B) fusion of hydrogen in the core and helium in a shell
C) fusion of helium in the core only
D) fusion of helium in the core and hydrogen in a shell

Question

Quizplus · Accepted Answer

Horizontal branch stars produce energy through the fusion of helium in their cores and hydrogen in a surrounding shell. This stage occurs after the red giant phase, when the core contracts and heats up enough for helium to begin fusing into carbon and oxygen, while hydrogen continues to fuse in a shell around the core.

How Does a Horizontal Branch Star Produce Energy