AN IMPROVED LINE-STRENGTH PARAMETERIZATION IN HOT-STAR WINDS

An alternative is suggested for the current standard for parameterizing the overall strength of the line opacity in hot-star winds, the so-called CAK k parameter. The objective is a better conceptualization of the physical effects that produce dramatic differences in the mass-loss rates between B, O, and Wolf-Rayet stars. The approach identifies a dimensionless line-strength parameter ($) over bar Q whose value is estimable from first principles and is fairly constant, nominally 2 x 10(3), and is proportional to metallicity. The order of this value derives immediately from the coherent amplification inherent in any resonance. This does not represent a new theory, but a conceptual map is laid out for understanding and constraining mass-loss rates of all line-driven winds. This is especially pertinent for unlocking the mystery of why Wolf-Rayet stars experience such copious mass loss despite their sub-O class luminosity.