The following questions refer to the sketch below of an H-R diagram for a star cluster.

-Consider the star to which the arrow points.How is it currently generating energy?
A)by gravitational contraction
B)by hydrogen shell burning around an inert helium core
C)by core hydrogen fusion
D)by core helium fusion combined with hydrogen shell burning
E)by both hydrogen and helium shell burning around an inert carbon core

Question

The following questions refer to the sketch below of an H-R diagram for a star cluster.
 
-Consider the star to which the arrow points.How is it currently generating energy?
A)by gravitational contraction 
B)by hydrogen shell burning around an inert helium core 
C)by core hydrogen fusion 
D)by core helium fusion combined with hydrogen shell burning 
E)by both hydrogen and helium shell burning around an inert carbon core

Quizplus · Accepted Answer

The arrow points to a star located on the red giant branch, which means it has evolved beyond the main sequence. The only option available that matches this situation is B, indicating that the star is undergoing hydrogen shell burning around an inert helium core.

The Following Questions Refer to the Sketch Below of an H-R