On the abundance of iron and zinc in metal-poor stars

We have obtained non-LTE zinc and iron abundances for two halo stellar groups with low metallicities. The non-LTE abundance corrections are increased with metallicity depletion. The dependence of [Zn/Fe] on [Fe/H] is discussed. It has been found that zinc relative abundance grows nonlinearly with the decrease of metallicity in a wide range from $0$ to $-5$.