Hertzsprung-Russell-diagram Sun

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Hertzsprung-Russell Diagram, HRD: Stellar Evolution

A Hertzsprung-Russell (temperature-luminosity) diagram (HRD) plots stars’ absolute luminosity (intrinsic brightness) versus their spectral type (related to temperature), and indicates a star’s place in its evolution. Above is an HRD of 23,000 nearby stars. Most stars fall into the central "main sequence" where they fuse hydrogen in their cores, from hot and bright (upper left) to cooler and less bright (lower right). The Sun is on the main sequence at luminosity 1 and B-V color index 0.66 (5780° K, spectral type G2).

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© Carl Woebcke: Hertzsprung-Russell-diagram: Star's Evolution-Life Cycle, 1991-2017. All rights reserved.