Scandium Abundance in F–G–K Stars in a Wide Metallicity Range

A new Sc II model atom has been constructed using up-to-date atomic data. To test it, we have carried out nonlocal thermodynamic equilibrium (non-LTE) calculations for three stars with reliably determined atmospheric parameters: the Sun, HD 61421 (Procyon), and 84937. Allowance departures from LTE leads to a decrease in root-mean-square abundance error compared case agreement, within limits of this error, abundances deduced different lines. The solar non-LTE $$\log\varepsilon_{\textrm{Sun}}=3.12\pm 0.05$$ exceeds meteoritic recommended by Lodders (2021) 0.08 dex. However, agreement 0.02 dex obtained Procyon. Based on high-resolution spectra, scandium 56 wide metallicity range, $${-}2.62\leq\textrm{[Fe/H]}\leq 0.24$$ . dependence [Sc/Fe] [Fe/H] demonstrates similarity behavior $$\alpha$$ -process elements: is enhanced relative iron ([Sc/Fe] $$\sim$$ 0.2) $$\textrm{[Fe/H]}<{-}1$$ , decreases increasing higher metallicity. correlates titanium abundance. results are important solving problem origin scandium.