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We present a new model atom of Zn I-II based on the most up-to-datephotoionisation cross-sections, electron-impact excitation rates, and ratecoefficients for the Zn I + H I and Zn II + H- collisions. The latter werecalculated using the multi-channel quantum asymptotic treatment based on theBorn-Oppenheimer approach. Non-LTE analysis was performed for the first timefor lines of Zn I and Zn II in the ultraviolet (UV) spectra of two verymetal-poor reference stars, HD 84937 and HD 140283. We found consistent non-LTEabundance from the resonance Zn I 2138 A line, the subordinate lines, and thelines of Zn II. In both stars, non-LTE leads to 0.17 dex higher averageabundance from Zn I, while, for Zn II lines, non-LTE corrections are minor anddo not exceed 0.06 dex. Using lines of Zn I in the high-resolution spectra, wedetermined the non-LTE abundances for a sample of 80 stars in the -2.5 < [Fe/H]< 0.2 metallicity range. The [Zn/Fe] versus [Fe/H] diagram reveals a dip, with[Zn/Fe] = 0.3 in the most metal-poor stars, a close-to-solar value for [Fe/H] =-1.2, and increasing [Zn/Fe] up to 0.3 in the thick disk stars. Theclose-to-solar metallicity stars have subsolar [Zn/H] = -0.1, on average.Non-LTE abundances of zinc were derived for the first time for seven referenceF to B-type stars. We provide a grid of the non-LTE abundance corrections.

monthly notices of the royal astronomical society

Non-LTE abundances of zinc in different spectral type stars and the  Galactic [Zn/Fe] trend based on quantum-mechanical data on inelastic  processes in zinc-hydrogen collisions