Author Question: An H-R diagram for a globular cluster will show a horizontal brancha line of stars above the ... (Read 54 times)

luminitza · **on:** Jul 27, 2018

An H-R diagram for a globular cluster will show a horizontal brancha 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?

A) They have inert (non-burning) carbon cores.
B) Their sole source of energy is hydrogen shell burning.
C) They generate energy through both hydrogen fusion and helium fusion.
D) In a particular star cluster, all horizontal branch stars have the same spectral type.

Question 2

The age of a star cluster may be estimated by determining the ________ of the Main Sequence at which stars are just in the process of evolving away to become giant stars.

Fill in the blank(s) with correct word