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The solar carbon, n...
The solar carbon, nitrogen, and oxygen abundances from a 3D LTE analysis of molecular lines
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- Amarsi, Anish M. (författare)
- Uppsala universitet,Teoretisk astrofysik
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- Grevesse, N. (författare)
- Univ Liege, Ctr Spatial Liege, Ave Pre Aily, B-4031 Angleur Liege, Belgium.;Univ Liege, Space Sci Technol & Astrophys Res STAR Inst, Allee 6 Aout,17,B5C, B-4000 Liege, Belgium.
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- Asplund, M. (författare)
- Australian Acad Sci, Box 783, Canberra, ACT 2601, Australia.
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- Collet, R. (författare)
- Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus, Denmark.
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(creator_code:org_t)
- 2021-12-09
- 2021
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 656
- Relaterad länk:
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http://arxiv.org/pdf...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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 local thermodynamic equilibrium (LTE) line formation, we find log ϵC = 8.47 ± 0.02, log ϵN = 7.89 ± 0.04, and log ϵO = 8.70 ± 0.04. 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- radiative transfer
- line: formation
- Sun: abundances
- Sun: photosphere
- Sun: atmosphere
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- art (ämneskategori)
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