| Issue |
A&A
Volume 431, Number 1, February III 2005
|
|
|---|---|---|
| Page(s) | 1 - 5 | |
| Section | Astrophysical processes | |
| DOI | https://doi.org/10.1051/0004-6361:20041259 | |
| Published online | 02 February 2005 | |
About diffusivity, radiative viscosity and particle transport
1
LUTH (Observatoire de Paris - CNRS), Observatoire de Meudon, 92195 Meudon Cedex, France e-mail: georges.alecian@obspm.fr
2
Département de Physique, Université de Montréal, Montréal, PQ, H3C 3J7, Canada e-mail: michaudg@astro.umontreal.ca
Received:
7
May
2004
Accepted:
10
October
2004
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, [CITE] made the ad hoc hypothesis that turbulent diffusion was proportional to radiative viscosity.
Key words: diffusion / stars: general
© ESO, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.