تقرير
Line-drag damping of Alfv\'en waves in radiatively driven winds of magnetic massive stars
| العنوان: | Line-drag damping of Alfv\'en waves in radiatively driven winds of magnetic massive stars |
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| المؤلفون: | Driessen, F. A., Kee, N. D., Sundqvist, J. O., Owocki, S. P. |
| سنة النشر: | 2020 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | Line-driven stellar winds from massive (OB) stars are subject to a strong line-deshadowing instability. Recently, spectropolarimetric surveys have collected ample evidence that a subset of Galactic massive stars hosts strong surface magnetic fields. We investigate here the propagation and stability of magneto-radiative waves in such a magnetised, line-driven wind. Our analytic, linear stability analysis includes line-scattering from the stellar radiation, and accounts for both radial and non-radial perturbations. We establish a bridging law for arbitrary perturbation wavelength after which we analyse separately the long- and short-wavelength limits. While long-wavelength radiative and magnetic waves are found to be completely decoupled, a key result is that short-wavelength, radially propagating Alfv\'en waves couple to the scattered radiation field and are strongly damped due to the line-drag effect. This damping of magnetic waves in a scattering-line-driven flow could have important effects on regulating the non-linear wind dynamics, and so might also have strong influence on observational diagnostics of the wind structure and clumping of magnetic line-driven winds. Comment: 11 pages, 3 figures. Accepted for publication in MNRAS |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/staa3196 |
| URL الوصول: | http://arxiv.org/abs/2010.05650 |
| رقم الأكسشن: | edsarx.2010.05650 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/staa3196 |
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