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Helioseismic investigation has suggested to apply the turbulent convectionmodels (TCMs) to the convective overshooting. Using the turbulent velocity inthe overshooting region determined by the TCM, one can deal with theovershooting mixing as a diffusion process, which leads to incomplete mixing.It has been found that this treatment can improve the solar sound speed and theLi depletion in open clusters. In order to investigate whether the TCM can beapplied to the overshooting mixing outside the stellar convective core, newobservations of the eclipsing binary star HY Vir are adopted to calibrate theovershooting mixing parameter. The main conclusions are as follows: (i) the TCMparameters and the overshooting mixing parameter in the solar case are alsosuitable for the eclipsing binary system HY Vir; (ii) the incomplete mixingresults in a continuous profile of the hydrogen abundance; (iii) the e-foldinglength of the region, in which the hydrogen abundance changes due to theovershooting mixing, increases during the stellar evolution.

Testing the core overshooting mixing described by the turbulent convection model on the eclipsing binary star HY Vir