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The most massive stars remaining on the main sequence indicate the cluster's age.
What is the approximate age of the star cluster in the HR diagram quizlet?
Spectral types O and B main sequence stars have a core hydrogen supply that is enough for around 350 million years; types A and F, for about 2 billion years; type G, for about 10 billion years; and types K and M, for about 30 billion years.
Astronomers can establish the age of a globular cluster by plotting the stars in the cluster on a Hertzprung-Russell diagram and comparing the main sequence turnoff point with stellar evolution models.
Similar to our Sun, main sequence stars consume hydrogen. The upper left of the strip is home to hotter, more massive main sequence stars. Cooler, less massive stars can be observed at bottom right. Massive stars swiftly exhaust all of their hydrogen in a few of million years.
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