Discrete Absorption Components from 3-D spot models of hot star winds

Abstract The winds of hot, massive stars are variable from processes happening on both large and small spatial scales. A particular case such wind variability is ‘discrete-absorption components’ (DACs) that manifest themselves as outward moving density features in UV resonance line spectra. Such DACs believed to be caused by large-scale spiral-shaped structures the stellar wind. We consider novel 3-D radiation-hydrodynamic models rotating hot star study emergence co-rotating spiral due a local (pseudo-)magnetic spot surface. Subsequently, hydrodynamic used retrieve DAC spectral signatures synthetic spectra created short-characteristics radiative transfer code.