Abstract
Spectroscopic observations are discussed which indicate that the winds of luminous OB stars are highly structured in space and variable in time. Blueward migrating discrete optical depth enhancements in the absorption troughs of P Cygni profiles are the characteristic signatures of the evolving structure. Constraints on physical mechanisms are discussed, provided by the observed accelerations of the migrating features, the evidence for rotationally modulated variability, and the behaviour of the winds at very low velocities.
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Prinja, R.K. (1994). Time-Dependent Phenomena in OB Star Winds. In: Balona, L.A., Henrichs, H.F., Le Contel, J.M. (eds) Pulsation, Rotation and Mass Loss in Early-Type Stars. International Astronomical Union / Union Astronomique Internationale, vol 162. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1030-3_144
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DOI: https://doi.org/10.1007/978-94-011-1030-3_144
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