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Astron. Astrophys. 347, 272-276 (1999)

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On an overshooting approach to the solar Li problem

H. Schlattl and A. Weiss

Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, D-85748 Garching, Germany

Received 28 January 1999 / Accepted 16 April 1999


To solve the solar Li-problem and to reduce the deviation between the sound speed of standard solar models and that infered from helioseismology, which is a persistent feature immediately below the convective envelope in most solar models, some additional mixing effect can be postulated. We investigate, how a recently proposed parametric prescription of overshooting, which is based on two-dimensional hydrodynamical calculations, affects both the lithium content and the seismic properties of the models. While we conclude that for a certain choice of the free parameter the observed lithium depletion can be reproduced, we also show that this parameter is neither constant within the Sun, nor during its evolution. Further, all models with overshooting agree less with the seismic model than the standard model.

Key words: convection – Sun: abundances – Sun: evolution – Sun: interior – stars: interiors

Send offprint requests to: A. Weiss (weiss@mpa-garching.mpg.de)

Correspondence to: A. Weiss

© European Southern Observatory (ESO) 1999

Online publication: June 18, 1999