The 3D non-LTE solar nitrogen abundance from atomic lines

Nitrogen is an important element in various fields of stellar and Galactic astronomy, and the solar nitrogen abundance is crucial as a yardstick for comparing different objects in the cosmos. In order to obtain a precise and accurate value for this abundance, we carried out NI line formation calculations in a 3D radiative-hydrodynamicSTAGGER model solar atmosphere in full 3D non-local thermodynamic equilibrium (non-LTE). We used a model atom that includes physically motivated descriptions for the inelastic collisions of NI with free electrons and with neutral hydrogen. We selected five NI lines of high excitation energy to study in detail, based on their strengths and on their being relatively free of blends. We found that these lines are slightly strengthened from non-LTE photon losses and from 3D granulation effects, resulting in negative abundance corrections of around - 0.01 dex and - 0.04 dex, respectively. Our advocated solar nitrogen abundance is log (N) = 7.77, with the systematic 1 sigma uncertainty estimated to be 0.05 dex. This result is consistent with earlier studies after correcting for differences in line selections and equivalent widths.

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
atomic processes
radiative transfer
line: formation
Sun: abundances
Sun: photosphere
stars: abundances

Grevesse, N.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. (författare)
Grumer, JonUppsala universitet,Teoretisk astrofysik(Swepub:uu)jongr291 (författare)
Asplund, M.Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2600, Australia. (författare)
Barklem, PaulUppsala universitet,Teoretisk astrofysik(Swepub:uu)pba11670 (författare)
Collet, R.Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark. (författare)
Uppsala universitetTeoretisk astrofysik (creator_code:org_t)

Av författaren/redakt...: Amarsi, Anish; Grevesse, N.; Grumer, Jon; Asplund, M.; Barklem, Paul; Collet, R.

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