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Hayashi limit

noun

Etymology

Named after the Japanese astrophysicist Chushiro Hayashi.

Definitions

  1. A theoretical maximum radius of a star of given mass

    A theoretical maximum radius of a star of given mass; the radius at which the inward force of gravity exactly balances the outward pressure of the gas of the star.

    • When a star is fully within hydrostatic equilibrium—a condition where the inward force of gravity is matched by the outward pressure of the gas—the star can not exceed the radius defined by the Hayashi limit.^([Wikipedia])
    • However, the approximate locations of the Hayashi limits point to remarkably low masses for the three T Tauri stars investigated here. It should be noted, that the Hayashi limits are valid only for stars in hydrostatic equilibrium.
    • Since the Hayashi limit approaches close to the main sequence at about 1 M⊙, the 'Hertzsprung gap' between the terminal main sequence and the Hayashi limit is much less marked than at high masses.

The neighborhood

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sense glosses and etymology drawn from English Wiktionary · source · CC-BY-SA