About diffusivity, radiative viscosity and particle transport - Archive ouverte HAL
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2005

About diffusivity, radiative viscosity and particle transport

Résumé

It is shown that the process called radiative diffusivity by Morel & Thévenin (2002, 390, 611) does not exist as they describe it. Their description is based on a confusion between atomic diffusion and turbulent transport (often called turbulent diffusion in the context of particle transport in stars). We evaluate how ions are slowed down by photons and show that this may be neglected in atomic diffusion calculations. In their evolutionary model calculations, \citet{MorelTh2002} made the {ad hoc} hypothesis that turbulent diffusion was proportional to radiative viscosity.

Dates et versions

hal-03742987 , version 1 (02-08-2022)

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Citer

Georges Alecian, G. Michaud. About diffusivity, radiative viscosity and particle transport. Astronomy and Astrophysics - A&A, 2005, 431, pp.1-5. ⟨10.1051/0004-6361:20041259⟩. ⟨hal-03742987⟩
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