Turnoff point
type: Concept
contributor: AAS Frey.Katie
broader: Hertzsprung Russell diagram
definition: The point on the Hertzsprung-Russell diagram of a star cluster at which stars begin to leave the main sequence and move toward the red giant branch. The main-sequence turnoff is a measure of age. In general, the older a star cluster, the fainter the main-sequence turnoff.
modified: 2020-11-19T16:44:48.44Z
modified: 2020-11-19T16:44:37.661Z

Hertzsprung Russell diagram
type: Concept
narrower: Turnoff point