The spectral type of the hottest main-sequence star in a stellar cluster serves as a proxy for the cluster's age.
We can determine the age of a star cluster by looking at the spectral type of the star in the cluster with the hottest main-sequence star. Main sequence turnoff is a reliable indicator of cluster ages.
The cluster's age is revealed by the main sequence switch off time. The luminosity, temperature, size, and rate of accretion off the main sequence of a star are all determined by its mass. It is good that this is the case since stars with similar masses will evolve at the same speed.
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