On an H-R Diagram of a Cluster of Stars, Which

question 17

Multiple Choice

On an H-R diagram of a cluster of stars, which characteristic of the diagram do astronomers use as a good indicator of the cluster's age?

• A) the number of M stars on the main sequence
• B) the lowest luminosity star that is visible in the cluster
• C) the point on the main sequence where stars begin to "turn off" -- to move toward the red giant region
• D) how high up on the main sequence M type stars are found
• E) the coolest surface temperature for a star that they can measure

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