Stellar isochrone
= Stellar isochrone
{wiki=Stellar_isochrone}
A stellar isochrone is a curve representing the positions of stars of different masses that are at the same age but in different stages of their evolution on a Hertzsprung-Russell diagram (H-R diagram). The H-R diagram plots a star's luminosity (or absolute magnitude) against its temperature (or spectral type), allowing astronomers to analyze stellar populations and their evolutionary stages.