Eddington Limit
The Eddington limit, also called the Eddington luminosity, is the point at which the luminosity emitted by a star or active galaxy is so extreme that it starts blowing off the outer layers of the object. Physically speaking, it is the greatest luminosity that can pass through a gas in Hydrostatic equilibrium, meaning that greater luminosities destroy the equilibrium. Hydrostatic equilibrium is the quality that keeps a star round and approximately the same size over time.
The
theoretical limit at which the photon pressure
would exceed the gravitational attraction of a light-emitting body. That is, a
body emitting radiation at greater than the Eddington limit would break up from
its own photon pressure.
Source: wikipedia, NASA
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