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Solar Chemical Abundances Determined with a CO5BOLD 3D Model Atmosphere

  • Helioseismology
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Abstract

In the last decade, the photospheric solar metallicity as determined from spectroscopy experienced a remarkable downward revision. Part of this effect can be attributed to an improvement of atomic data and the inclusion of NLTE computations, but also the use of hydrodynamical model atmospheres seemed to play a role. This “decrease” with time of the metallicity of the solar photosphere increased the disagreement with the results from helioseismology. With a CO 5 BOLD 3D model of the solar atmosphere, the CIFIST team at the Paris Observatory re-determined the photospheric solar abundances of several elements, among them C, N, and O. The spectroscopic abundances are obtained by fitting the equivalent width and/or the profile of observed spectral lines with synthetic spectra computed from the 3D model atmosphere. We conclude that the effects of granular fluctuations depend on the characteristics of the individual lines, but are found to be relevant only in a few particular cases. 3D effects are not responsible for the systematic lowering of the solar abundances in recent years. The solar metallicity resulting from this analysis is Z=0.0153, Z/X=0.0209.

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Authors and Affiliations

  1. GEPI, Observatoire de Paris, CNRS, Université Paris Diderot, 92195, Meudon Cedex, France

    E. Caffau, H.-G. Ludwig & P. Bonifacio

  2. CIFIST Marie Curie Excellence Team, Observatoire de Paris, 92195, Meudon Cedex, France

    H.-G. Ludwig & P. Bonifacio

  3. Zentrum für Astronomie der Universität Heidelberg, Landessternwarte, Königstuhl 12, 69117, Heidelberg, Germany

    H.-G. Ludwig

  4. Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482, Potsdam, Germany

    M. Steffen

  5. CRAL, UMR 5574: CNRS, Université de Lyon, École Normale Supérieure de Lyon, 46 allée d’Italie, 69364, Lyon Cedex 7, France

    B. Freytag

  6. Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, 34143, Trieste, Italy

    P. Bonifacio

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  1. E. Caffau
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  2. H.-G. Ludwig
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  3. M. Steffen
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  4. B. Freytag
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Correspondence to E. Caffau.

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Helioseismology

Guest Editors: G. Houdek, H. Shibahashi, and J. Zhao.

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Caffau, E., Ludwig, HG., Steffen, M. et al. Solar Chemical Abundances Determined with a CO5BOLD 3D Model Atmosphere. Sol Phys 268, 255–269 (2011). https://doi.org/10.1007/s11207-010-9541-4

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