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3D non-LTE line formation of neutral carbon in the Sun
Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark.
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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2019 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 624, article id A111Article in journal (Refereed) Published
Abstract [en]

Carbon abundances in late-type stars are important in a variety of astrophysical contexts. However C I lines, one of the main abundance diagnostics, are sensitive to departures from local thermodynamic equilibrium (LTE). We present a model atom for non-LTE analyses of C I lines, that uses a new, physically-motivated recipe for the rates of neutral hydrogen impact excitation. We analyse C I lines in the solar spectrum, employing a three-dimensional (3D) hydrodynamic model solar atmosphere and 3D non-LTE radiative transfer. We find negative non-LTE abundance corrections for C I lines in the solar photosphere, in accordance with previous studies, reaching up to around 0.1 dex in the disk-integrated flux. We also present the first fully consistent 3D non-LTE solar carbon abundance determination: we infer log is an element of(C) = 8.44 ± 0.02, in good agreement with the current standard value. Our models reproduce the observed solar centre-to-limb variations of various C I lines, without any adjustments to the rates of neutral hydrogen impact excitation, suggesting that the proposed recipe may be a solution to the long-standing problem of how to reliably model inelastic collisions with neutral hydrogen in late-type stellar atmospheres.

Place, publisher, year, edition, pages
2019. Vol. 624, article id A111
Keywords [en]
atomic data, radiative transfer, line: formation, Sun: abundances, Sun: photosphere
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-382839DOI: 10.1051/0004-6361/201833603ISI: 000464916800003OAI: oai:DiVA.org:uu-382839DiVA, id: diva2:1316564
Funder
Swedish Research CouncilKnut and Alice Wallenberg FoundationAustralian Research Council, DP150100250Australian Research Council, FL110100012Swedish National Infrastructure for Computing (SNIC), SNIC2018-3-465Danish National Research Foundation, DNRF106Available from: 2019-05-20 Created: 2019-05-20 Last updated: 2019-05-20Bibliographically approved

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