An Etymological Dictionary of Astronomy and Astrophysics
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In the theory of → radiation-driven winds, an equation that describes the behavior of the → wind velocity of → hot stars as a function of distance from the star. This velocity β-law is given by the expression: v(r) = v_∞(1 - R_*/r)^β, where v_∞ is the → terminal velocity, R_* is the stellar radius, and r the distance from the center. For → O-type stars, the exponent is estimated to be β = 0.8.

→ velocity; → law.