Turnoff point

HR diagrams for two open clusters, M67 and NGC 188, showing the main sequence turn-off at different ages.

The turnoff point for a star refers to the point on the Hertzsprung-Russell diagram where it leaves the main sequence after the exhaustion of its main fuel. Sun-like stars will enter the red giant branch as subgiants.

By plotting the turnoff point of the stars in star clusters, one can estimate the cluster's age.

单词	Turnoff point
释义	Turnoff point 英语百科 Turnoff point The turnoff point for a star refers to the point on the Hertzsprung-Russell diagram where it leaves the main sequence after the exhaustion of its main fuel. Sun-like stars will enter the red giant branch as subgiants. By plotting the turnoff point of the stars in star clusters, one can estimate the cluster's age.
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