ИСТИНА

According recent helioseismic calibrations (MNRAS v.430, No 3, p.1636, 2013)adiabatic compressibility in solar convection zone conforms to models with low heavy element abundance (Z). This result relies on calibrations of models with two independent EOS calculations (OPAL and SAHA-S) which agree on low Z content. These helioseismic calibrations also give helium abundance in convection zone and convection zone mass parameter M75=0.9822 (M75 = Mr/M (r/R=0.75)). Standard solar model (with high Z content) conforms to helium abundance but have M75=0.9826. We attempt to construct solar models with proper M75 in envelope while conforming to helioseismic sound speed profile below the convection zone. The question of low Z in convection zone remains open.