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Astron. Astrophys. 322, 646-652 (1997)


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A solar model with improved subatmospheric stratification

H. Schlattl , A. Weiss and H.-G. Ludwig

Max-Planck-Institut für Astrophysik, Postfach 1523, D-85740 Garching, Germany

Received 4 November 1996 / Accepted 3 December 1996

Abstract

The calculated intermediate and high degree p-mode frequencies of standard solar models show greater disagreement with the observations than low degree modes. This leads to the conclusion that the subatmospheric structure of the models has to be improved. We are presenting solar models with up-to-date input physics and controlled numerical accuracy of [FORMULA]. For the outer boundary condition we use synthetic atmospheres fitted to the interior solution at [FORMULA]. In addition, a spatially variable mixing length parameter is employed to reproduce the pressure-temperature stratification of the outer convective zone calculated by 2D-hydrodynamical models we used for comparison. With this changed subatmospheric structure we could improve the agreement between predicted and observed p-mode frequencies in our solar models.

Key words: Sun: interior; oscillations

Send offprint requests to: H. Schlattl (schlattl@mpa-garching.mpg.de)

© European Southern Observatory (ESO) 1997

Online publication: June 5, 1998

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