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We revisit the Galactic chemical evolution of oxygen, addressing thesystematic errors inherent in classical determinations of the oxygen abundancethat arise from the use of one dimensional hydrostatic (1D) model atmospheresand from the assumption of local thermodynamic equilibrium (LTE). We performdetailed 3D non-LTE radiative transfer calculations for atomic oxygen linesacross a grid of 3D hydrodynamic stag- ger model atmospheres for dwarfs andsubgiants. We apply our grid of predicted line strengths of the [OI] 630 nm andOI 777 nm lines using accurate stellar parameters from the literature. We infera steep decay in [O/Fe] for [Fe/H] $\gtrsim$ -1.0, a plateau [O/Fe] $\approx$0.5 down to [Fe/H] $\approx$ -2.5 and an increasing trend for [Fe/H] $\lesssim$-2.5. Our 3D non-LTE calculations yield overall concordant results from the twooxygen abundance diagnostics.

The Galactic chemical evolution of oxygen inferred from 3D non-LTE spectral line formation calculations