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

Published online by Cambridge University Press:  16 August 2023

F. A. Driessen Open the ORCID record for F. A. Driessen [Opens in a new window]  and
N. D. Kee Open the ORCID record for N. D. Kee [Opens in a new window]
F. A. Driessen
Affiliation:
Institute of Astronomy, KU Leuven, Celestijnenlaan 200D/2401, 3001 Leuven, Belgium National Solar Observatory, 22 Ohi‘a Ku St., Makawao, HI 96768, USA
N. D. Kee
Affiliation:
National Solar Observatory, 22 Ohi‘a Ku St., Makawao, HI 96768, USA
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Abstract

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.

Keywords

hydrodynamicsline: formationradiative transferstars: early-typestars: windsoutflows
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 17 , Symposium S370: Winds of Stars and Exoplanets , August 2021 , pp. 161 - 167
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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