Rotational Modulation of Hot-Star Winds

• Monitoring campaigns of P-Cygni lines formed in hot-star winds also often show modulation at periods comparable to the stellar rotation period.

• These may stem from large-scale surface structure that induces spiral wind variation analogous to solar Corotating Interaction Regions.

HD64760 Monitored during

IUE “Mega” Campaign

Radiation hydrodynamics

simulation of CIRs in a hot-star wind

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