Zero-age Main Sequence (zams)

Region on the Hertzsprung-Russell diagram, as predicted by theoretical models, where stars are located at the onset of nuclear hydrogen burning in their cores. These stars are new additions to the main sequence, a place where they will spend about 90% of their lives and maintain remarkably stable luminosities. After this time, they evolve off the ZAMS to the upper right of the main sequence to become red giant or supergiant stars.

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