An Astronomer Plots the H-R Diagram of a Star Cluster

question 218

Multiple Choice

An astronomer plots the H-R diagram of a star cluster and finds that it contains hot B-type stars on the main sequence and cooler G- and K-type stars noticeably above the main sequence. This cluster is

• A) of indeterminate age since the age of the cluster cannot be estimated from the information given.
• B) impossible because cool stars cannot be above the main sequence when hot stars are on the main sequence.
• C) old because the G and K stars are already evolving off (away from) the main sequence.
• D) very young because the G and K stars are still evolving toward the main sequence.

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