What Is the Turnoff Point for a Star Cluster

question 234

Multiple Choice

What is the turnoff point for a star cluster?

• A) point in the Hertzsprung-Russell diagram occupied by stars undergoing (or about to undergo) the helium flash
• B) point in the Hertzsprung-Russell diagram occupied by the highest-mass main-sequence stars in the cluster
• C) point in the Hertzsprung-Russell diagram occupied by the lowest-mass main-sequence stars in the cluster
• D) point in the Hertzsprung-Russell diagram occupied by the highest-mass stars that have not yet reached the main sequence

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