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The Solar Photospheric Nitrogen Abundance: Determination with 3D and 1D Model Atmospheres

Published online by Cambridge University Press:  05 March 2013

E. Maiorca ,
E. Caffau ,
P. Bonifacio ,
M. Busso ,
R. Faraggiana ,
M. Steffen ,
H.-G. Ludwig  and
I. Kamp
E. Maiorca*
Affiliation:
Dipartimento di Fisica, Universitá degli studi di Perugia, via Pascoli, Perugia, I-06123, Italy
E. Caffau
Affiliation:
GEPI, Observatoire de Paris, CNRS, Université Paris Diderot; 92195 Meudon Cedex, France
P. Bonifacio
Affiliation:
GEPI, Observatoire de Paris, CNRS, Université Paris Diderot; 92195 Meudon Cedex, France CIFIST Marie Curie Excellence Team Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Trieste, Via Tiepolo 11, I-34143 Trieste, Italy
M. Busso
Affiliation:
Dipartimento di Fisica, Universitá degli studi di Perugia, via Pascoli, Perugia, I-06123, Italy Kapteyn Astronomical Institute, Postbus 800, 9700 AV Groningen
R. Faraggiana
Affiliation:
Istituto Nazionale di Fisica Nucleare, section of Perugia, via Pascoli, Perugia, I-06123, Italy
M. Steffen
Affiliation:
Dipartimento di Astronomia, Università degli Studi di Trieste, via G.B. Tiepolo 11, 34143 Trieste, Italy
H.-G. Ludwig
Affiliation:
GEPI, Observatoire de Paris, CNRS, Université Paris Diderot; 92195 Meudon Cedex, France CIFIST Marie Curie Excellence Team
I. Kamp
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany
*
ICorresponding author. Email: emaiorca@gmail.com
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Abstract

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We present a new determination of the solar nitrogen abundance making use of 3D hydrodynamical modelling of the solar photosphere, which is more physically motivated than traditional static 1D models. We selected suitable atomic spectral lines, relying on equivalent width measurements already existing in the literature. For atmospheric modelling we used the co5bold 3D radiation hydrodynamics code. We investigated the influence of both deviations from local thermodynamic equilibrium (non-LTE effects) and photospheric inhomogeneities (granulation effects) on the resulting abundance. We also compared several atlases of solar flux and centre-disc intensity presently available. As a result of our analysis, the photospheric solar nitrogen abundance is A(N) = 7.86 ± 0.12.

Keywords

hydrodynamicsline: formationradiative transferSun: abundancesSun: granulationSun: atmosphere
Type
Observations
Information
Publications of the Astronomical Society of Australia , Volume 26 , Issue 3 , 2009 , pp. 345 - 350
Copyright
Copyright © Astronomical Society of Australia 2009

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