The solar carbon, nitrogen, and oxygen abundances from a 3D LTE analysis of molecular lines
| Autor: | Amarsi, A. M., Grevesse, N., Asplund, M., Collet, R. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | A&A 656, A113 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1051/0004-6361/202141384 |
| Popis: | Carbon, nitrogen, and oxygen are the fourth, sixth, and third most abundant elements in the Sun. Their abundances remain hotly debated due to the so-called solar modelling problem that has persisted for almost $20$ years. We revisit this issue by presenting a homogeneous analysis of $408$ molecular lines across $12$ diagnostic groups, observed in the solar intensity spectrum. Using a realistic 3D radiative-hydrodynamic model solar photosphere and LTE (local thermodynamic equilibrium) line formation, we find $\log\epsilon_{C} = 8.47\pm0.02$, $\log\epsilon_{N} = 7.89\pm0.04$, and $\log\epsilon_{O} = 8.70\pm0.04$. The stipulated uncertainties mainly reflect the sensitivity of the results to the model atmosphere; this sensitivity is correlated between the different diagnostic groups, which all agree with the mean result to within $0.03$ dex. For carbon and oxygen, the molecular results are in excellent agreement with our 3D non-LTE analyses of atomic lines. For nitrogen, however, the molecular indicators give a $0.12$ dex larger abundance than the atomic indicators, and our best estimate of the solar nitrogen abundance is given by the mean: $7.83$ dex. The solar oxygen abundance advocated here is close to our earlier determination of $8.69$ dex, and so the present results do not significantly alleviate the solar modelling problem. Comment: 12 pages, 6 figures, 3 tables; accepted for publication in Astronomy & Astrophysics |
| Databáze: | arXiv |
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