Why Does the Hertzsprung-Russell Diagram of a Globular Cluster NOT

question 167

Multiple Choice

Why does the Hertzsprung-Russell diagram of a globular cluster NOT contain any stars with high luminosity and high temperature on the main sequence?

• A) These high-mass stars evolved away from the main sequence long ago.
• B) Stars that will occupy this position on the main sequence have not yet evolved there from the protostar stage.
• C) The stars that were in this position on the main sequence have undergone splitting into binary stars and hence appear lower down on the diagram.
• D) This type of cluster contains only low-mass stars and has never had high-luminosity stars on its main sequence.

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