August 7-10, 2017


Hot-star winds: theoretical predictions and observational evidence"

Stanley Owocki (University of Delaware)

Hot stars have strong stellar winds, driven by the line-scattering of the starís continuum radiation. Building on a brief review of the basic CAK theory for steady-state winds, this talk will focus on the causes of wind variability. This includes both the strong, intrinsic "line-deshadowing instability" that can drive small-scale compressible turbulence, as well ways that variations on the stellar surface (bright spots, pulsations, magnetic fields) can induce larger-scale wind structure. The former are best diagnosed by associated X-ray emission from wind shocks or effects on UV wind lines; but the latter can be associated with continuum variations well-suited to monitoring by precision photometric monitoring from space-based platforms like the BRITE satellites.

Mode of presentation need to be confirmed by the SOC