Academic Journal
3D non-LTE line formation of neutral carbon in the Sun
| العنوان: | 3D non-LTE line formation of neutral carbon in the Sun |
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| المؤلفون: | Amarsi, A. M., Barklem, P. S., Collet, R., Grevesse, N., Asplund, M. |
| المصدر: | Amarsi , A M , Barklem , P S , Collet , R , Grevesse , N & Asplund , M 2019 , ' 3D non-LTE line formation of neutral carbon in the Sun ' , Astronomy and Astrophysics , vol. 624 , A111 . https://doi.org/10.1051/0004-6361/201833603 |
| سنة النشر: | 2019 |
| المجموعة: | Aarhus University: Research |
| مصطلحات موضوعية: | ATOM-ATOM COLLISIONS, CNO ABUNDANCES, CROSS-SECTIONS, LATE-TYPE STARS, OPACITY CALCULATIONS, PAULI ENERGY-LEVELS, RADIATIVE-TRANSFER, SOLAR GRANULATION, STATISTICAL EQUILIBRIUM, Sun: abundances, Sun: photosphere, TO-LIMB VARIATION, atomic data, line: formation, radiative transfer |
| الوصف: | 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 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. |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | https://pure.au.dk/portal/en/publications/dafddc68-d5b0-4f49-9a4a-43db9cf49fe2 |
| DOI: | 10.1051/0004-6361/201833603 |
| الاتاحة: | https://pure.au.dk/portal/en/publications/dafddc68-d5b0-4f49-9a4a-43db9cf49fe2 https://doi.org/10.1051/0004-6361/201833603 https://pure.au.dk/ws/files/193938060/3D_non_LTE_line_formation_of_neutral_carbon_in_the_Sun.pdf http://www.scopus.com/inward/record.url?scp=85065014171&partnerID=8YFLogxK |
| Rights: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.7EB07E52 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1051/0004-6361/201833603 |
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