Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...454..410g&link_type=abstract
Astrophysical Journal v.454, p.410
Astronomy and Astrophysics
Astronomy
72
Line: Formation, Stars: Early-Type, Stars: Mass Loss, Stars: Wolf-Rayet
Scientific paper
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 κ parameter. The objective is a better conceptualization of the physical effects that produce dramatic differences in the mass-loss rates between B, 0, and Wolf-Rayet stars. The approach identifies a dimensionless line-strength parameter ‾Q whose value is estimable from first principles and is fairly constant, nominally 2 × 103, 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-0 class luminosity.
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