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Ultraviolet line profiles of slowly rotating massive star winds using the ‘analytic dynamical magnetosphere’ formalism

Erba, C ; David-Uraz, A ; Petit, V ; Hennicker, L ; Fletcher, C ; Fullerton, A W ; Naze, Y ; Sundqvist, J ; ud-Doula, A

Monthly notices of the Royal Astronomical Society, 2021-10, Vol.506 (4), p.5373-5388 [Periódico revisado por pares]

Goddard Space Flight Center: Royal Astronomical Society / Oxford University Press

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  • Título:
    Ultraviolet line profiles of slowly rotating massive star winds using the ‘analytic dynamical magnetosphere’ formalism
  • Autor: Erba, C ; David-Uraz, A ; Petit, V ; Hennicker, L ; Fletcher, C ; Fullerton, A W ; Naze, Y ; Sundqvist, J ; ud-Doula, A
  • Assuntos: Astronomy ; Astrophysics ; Astrophysics - Solar and Stellar Astrophysics ; Aérospatiale, astronomie & astrophysique ; line: profiles ; outflows ; Physical, chemical, mathematical & earth Sciences ; Physique, chimie, mathématiques & sciences de la terre ; radiative transfer ; Space science, astronomy & astrophysics ; stars: magnetic field ; stars: massive ; stars: winds ; ultraviolet: stars
  • É parte de: Monthly notices of the Royal Astronomical Society, 2021-10, Vol.506 (4), p.5373-5388
  • Notas: GSFC
    Goddard Space Flight Center
    scopus-id:2-s2.0-85117788073
  • Descrição: Recent large-scale spectropolarimetric surveys have established that a small but significant percentage of massive stars host stable, surface dipolar magnetic fields with strengths on the order of kG. These fields channel the dense, radiatively driven stellar wind into circumstellar magnetospheres, whose density and velocity structure can be probed using ultraviolet (UV) spectroscopy of wind-sensitive resonance lines. Coupled with appropriate magnetosphere models, UV spectroscopy provides a valuable way to investigate the wind–field interaction, and can yield quantitative estimates of the wind parameters of magnetic massive stars. We report a systematic investigation of the formation of UV resonance lines in slowly rotating magnetic massive stars with dynamical magnetospheres. We pair the analytic dynamical magnetosphere (ADM) formalism with a simplified radiative transfer technique to produce synthetic UV line profiles. Using a grid of models, we examine the effect of magnetosphere size, the line strength parameter, and the cooling parameter on the structure and modulation of the line profile. We find that magnetic massive stars uniquely exhibit redshifted absorption at most viewing angles and magnetosphere sizes, and that significant changes to the shape and variation of the line profile with varying line strengths can be explained by examining the individual wind components described in the ADM formalism. Finally, we show that the cooling parameter has a negligible effect on the line profiles.
  • Editor: Goddard Space Flight Center: Royal Astronomical Society / Oxford University Press
  • Idioma: Inglês
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