Аннотация:The first adiabatic exponent profile, noted Г1, computed along adiabatic coordinates (T , ρ),is in the focus of our study. Under conditions of almost fully ionized hydrogen and helium,the Г1 profile is quite sensitive to heavy elements ionization. Г1 decreases in regions wherean element is partially ionized. The recent helioseismic structural inversion is obtained withan accuracy better than 1e−4 in the most of the adiabatic convective zone that allows to studyionization variations. The aim is to determine the major heavy elements content in the solarconvective zone. The method of our research is synthesis of the Г1 profile, which is basedon a linear combination of the contributions of individual heavy elements. The idea of theapproach was proposed and justified by Baturin et al. (2022). We find the best approximationof the inverted profile Г1 adjusting the abundances of major elements (C, N, O, Ne),meanwhile the abundances of elements heavier than neon are fixed. We synthesize the theoreticalГ1 profile using the SAHA-S equation of state, and are able to reproduce the invertedprofiles with an accuracy of (1−2)e−5. Total mass fraction of heavy elements found withthis method is Z = 0.0148±0.0004. The oxygen logarithmic abundance is 8.70±0.03, carbon8.44 ± 0.04, nitrogen 8.12 ± 0.08, and neon 8.17 ± 0.09. The obtained estimations ofoxygen and carbon agree with spectroscopic abundances by Asplund, Amarsi, and Grevesse(2021).
