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In this work we present first results of our current project aimed atcombining the 3D hydrodynamical stellar atmosphere approach with non-LTE (NLTE)spectral line synthesis for a number of key chemical species. We carried out afull 3D-NLTE spectrum synthesis of the oxygen IR 777 nm triplet, using amodified and improved version of our NLTE3D package to calculate departurecoefficients for the atomic levels of oxygen in a CO5BOLD 3D hydrodynamicalsolar model atmosphere. Spectral line synthesis was subsequently performed withthe Linfor 3D code. In agreement with previous studies, we find that the linesof the oxygen triplet produce deeper cores under NLTE conditions, due to thediminished line source function in the line forming region. This means that thesolar oxygen IR 777 nm lines should be stronger in NLTE, leading to negative 3DNLTE-LTE abundance corrections. Qualitatively this result would supportprevious claims for a relatively low solar oxygen abundance. Finally, weoutline several further steps that need to be taken in order to improve thephysical realism and numerical accuracy of our current 3D-NLTE calculations.

Oxygen spectral line synthesis: 3D non-LTE with CO5BOLD hydrodynamical model atmospheres