Macroscopic Transport Large-scale advection, turbulent diffusion, wave transport |
| |
Authors: | Jean-Paul Zahn |
| |
Institution: | (1) Observatoire de Paris, 92195 Meudon, France |
| |
Abstract: | While the solar convection zone is very well mixed by its turbulent motions, chemical composition gradients build up in the
radiative interior due to microscopic diffusion and settling, and to nuclear burning. Standard models, which ignore any type
of macroscopic transport, cannot explain the depletion of lithium in solar-type stars, as they evolve; neither do they account
for the observed profile of molecular weight at the base of the solar convection zone.
Such macroscopic transport can be achieved through thermally driven meridian currents, through turbulent diffusion generated
by differential rotation and possibly through gravity waves. These processes transport also angular momentum, and therefore
the internal rotation profile of the Sun provides a crucial test for their relative importance. So does also the behavior
of tidally locked binaries, which appear to destroy less lithium than single stars of the same mass.
This revised version was published online in June 2006 with corrections to the Cover Date. |
| |
Keywords: | Stellar interiors stellar rotation turbulent transport |
本文献已被 SpringerLink 等数据库收录! |
|