In the Pleiades stars, a relationship was found: the lower the apparent brightness of the star, the more late spectral type it has.

In the Pleiades stars, a relationship was found: the lower the apparent brightness of the star, the more late spectral type it has. How can this be explained?

The luminosities of stars depend on their mass. The smaller the mass of the star, the lower it appears on the main sequence.

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