Discrete Absorption Components from 3-D spot models of hot star winds by F. A. Driessen et al. on Monday 21 November

The winds of hot, massive stars are variable from processes happening on both

large and small spatial scales. A particular case of such wind variability is

'discrete-absorption components' (DACs) that manifest themselves as outward

moving density features in UV resonance line spectra. Such DACs are believed to

be caused by large-scale spiral-shaped density structures in the stellar wind.

We consider novel 3-D radiation-hydrodynamic models of rotating hot star winds

and study the emergence of co-rotating spiral structures due to a local

(pseudo-)magnetic spot on the stellar surface. Subsequently, the hydrodynamic

models are used to retrieve DAC spectral signatures in synthetic UV spectra

created from a 3-D short characteristics radiative transfer code.

arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.09849v1