Publications
of the
MPIfR
Optical & Infrared
Interferometry Group
T. Blöcker, H. Holweger, B. Freytag, F.
Herwig, H.-G. Ludwig and
M. Steffen:
Lithium Depletion in the Sun: A Study of
Mixing Based on Hydrodynamical Simulations
Space Science Reviews 85, 105-112 (1998)
Abstract.
Based on radiation hydrodynamics modeling of stellar convection zones,
a diffusion scheme has been devised describing the downward penetration
of convective motions
beyond the Schwarzschild boundary (overshoot) into the radiative
interior. This scheme of exponential diffusive overshoot
has already been successfully applied to AGB stars.
Here we present an application to the Sun in order to determine
the time scale and depth extent of this additional mixing, i.e.
diffusive
overshoot at the base of the convective envelope. We calculated the
associated destruction of lithium during the evolution towards and on
the main-sequence. We found that the slow-mixing processes induced by
the
diffusive overshoot may lead to a substantial depletion of lithium
during
the Sun's main-sequence evolution.
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