Hertzsprung-Russell Diagram

The Hertzsprung-Russell diagram relates the brightness of a star to its temperature.

Zero-age Main Sequence
The position, on the main sequence of a Hertzsprung-Russell diagram, reached by stars after they have passed through their T Tauri phase. It corresponds to a star with 75% hydrogen, 23% helium and 2% metals in its core. Nuclear fusion then gradually changes this ratio and the star evolves across the main sequence.

See also: Star.

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Subjects: Physics