... photometry

Evolutionary tracks were calculated by Patrick Lenz using the Warshaw-New Jersey evolutionary code. Based on log L/$L_{\odot}$ = 1.322 derived from HIPPARCOS data and a  $T_{\rm eff}$ of 6900 K from photometric measurements, the mass of a post-main sequence model situated at this position in the HRD has been computed. The model has a chemical composition of X = 0.70 and Z = 0.02 and was computed using the OPAL equation of state and the OPAL gn93 opacities (Iglesias & Rogers 1996) extended by the Alexander & Ferguson tables (1994). A mixing length parameter $\alpha$ = 0.5 and convective core overshooting of $\alpha_{\rm ov}$ = 0.2 have been applied.

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