How do we know that hot star winds exist?
We see evidence in ultraviolet spectra due to line scattering in a dense outflow
Aside: The distinction between scattering, on the one hand, and absorption and re-emission, on the other:
Scattering is non-local; it is unaffected by the physical conditions at the place where the scattering occurs. Whereas with absorption followed by reemission, the properties of the radiation you observe are affected by the physical conditions (like tempe
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