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arXiv · 2304.01048

Solar oxygen abundance using SST/CRISP center-to-limb observations of the O I 7772 \r{A} line

A. G. M. Pietrow·R. Hoppe·M. Bergemann·F. Calvo
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Abstract

Solar oxygen abundance measurements based on the O I near-infrared triplet have been a much-debated subject for several decades since non-local thermodynamic equilibrium (NLTE) calculations with 3D radiation-hydrodynamics model atmospheres introduced a large change to the 1D LTE modelling. In this work, we aim to test solar line formation across the solar disk using new observations obtained with the SST/CRISP instrument. The observed dataset is based on a spectroscopic mosaic stretching from disk center to the solar limb. By comparing the state-of-the-art 3D NLTE models with the data, we find that the 3D NLTE models provide an excellent description of line formation across the disk. We obtain an abundance value of $A(\mathrm{O}) = (8.73 \pm 0.03)$ dex, with a very small angular dispersion across the disk. We conclude that spectroscopic mosaics are excellent probes for geometric and physical properties of hydrodynamics models and non-LTE line formation.

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A. G. M. Pietrow, R. Hoppe, M. Bergemann, F. Calvo. 2023-04-03. Solar oxygen abundance using SST/CRISP center-to-limb observations of the O I 7772 \r{A} line. https://doi.org/10.1051/0004-6361/202346387

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