3D distribution models of Ca, Cr, and Fe in a magnetic CP star atmosphere with anisotropic wind - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2021

3D distribution models of Ca, Cr, and Fe in a magnetic CP star atmosphere with anisotropic wind

G. Alecian
M. J. Stift
  • Function : Author

Abstract

We present time-dependent atomic diffusion calculations for Ca, Cr, and Fe in a stellar magnetic atmosphere including an anisotropic wind. For three different models of mass-loss rates (or wind), we obtain a 3D description of the entire atmosphere. In two of these models, the mass-loss rate varies according to the magnetic field inclination, the assumed field geometry being non-axisymmetric. When the dipolar component of the magnetic field dominates, we find that ring-like abundance structures will be prominent. Spot-like distributions can also exist according to the field geometry. Abundance distributions turn out to be highly sensitive to the mass-loss model. The results are discussed and compared to an observational model of a real chemically peculiar star (θ Aurigae) that features parameters close to those of the model we have adopted for our calculations.
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Dates and versions

insu-03713217 , version 1 (14-04-2023)

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G. Alecian, M. J. Stift. 3D distribution models of Ca, Cr, and Fe in a magnetic CP star atmosphere with anisotropic wind. Monthly Notices of the Royal Astronomical Society, 2021, 504, pp.1370-1378. ⟨10.1093/mnras/stab952⟩. ⟨insu-03713217⟩
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