J/A+A/656/A113 The solar CNO abundances (Amarsi+, 2021)
The solar carbon, nitrogen, and oxygen abundances from a 3D LTE analysis of
molecular lines.
Amarsi A.M., Grevesse N., Asplund M., Collet R.
<Astron. Astrophys. 656, A113 (2021)>
=2021A&A...656A.113A 2021A&A...656A.113A (SIMBAD/NED BibCode)
ADC_Keywords: Sun ; Spectroscopy ; Abundances
Keywords: radiative transfer - line: formation - Sun: abundances -
Sun: photosphere - Sun: atmosphere
Abstract:
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 logεC=8.47±0.02,
logεN=7.89±0.04, and logεO=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 0.03dex. 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 0.12dex larger
abundance than the atomic indicators, and our best estimate of the
solar nitrogen abundance is given by the mean: 7.83dex. The solar
oxygen abundance advocated here is close to our earlier determination
of 8.69dex, and so the present results do not significantly
alleviate the solar modelling problem.
Description:
Table 2 contains the parameters, measured equivalent widths, and
abundances inferred from the different models, for the 408 lines used
in the present analysis.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 87 408 Line information and abundances
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Species Species (12C16O, C2, CH, CN, NH or OH)
8- 11 A4 --- System System (Swan, A-X or X-X)
13 I1 --- |dnu| [0/2] Energy level separation
15- 19 A5 --- Band Band
21- 29 F9.3 nm lambdavac Wavelength in vacuum
31- 35 F5.3 eV Elow Excitation energy of the lower level
37- 42 F6.3 --- loggf Oscillator strength
44- 49 F6.3 pm W Equivalent width measured at disc-centre
51- 57 A7 --- Param Parameter (logepsC, logepsN or logepsO)
59- 63 F5.3 --- Abund3D 3D abundance for Parameter
65- 69 F5.3 --- Abund<3D> <3D> abundance for Parameter
71- 75 F5.3 --- AbundATMO ATMO abundance for Parameter
77- 81 F5.3 --- AbundMARCS MARCS abundance for Parameter
83- 87 F5.3 --- AbundHM74 HM74 abundance for Parameter
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Acknowledgements:
Anish Amarsi, anish.amarsi(at)physics.uu.se
(End) Patricia Vannier [CDS] 10-Sep-2021