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Lind, KarinUppsala universitet,Observationell astrofysik,Max Planck Inst Astron, Germany.
(author)
Non-LTE line formation of Fe in late-type stars - IV. Modelling of the solar centre-to-limb variation in 3D
- Article/chapterEnglish2017
Publisher, publication year, extent ...
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2017-03-25
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OXFORD UNIV PRESS,2017
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electronicrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:uu-327363
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-327363URI
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https://doi.org/10.1093/mnras/stx673DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-144759URI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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Our ability to model the shapes and strengths of iron lines in the solar spectrum is a critical test of the accuracy of the solar iron abundance, which sets the absolute zero-point of all stellar metallicities. We use an extensive 463-level Fe atom with new photoionization cross-sections for Fe I and quantum mechanical calculations of collisional excitation and charge transfer with neutral hydrogen; the latter effectively remove a free parameter that has hampered all previous line formation studies of Fe in non-local thermodynamic equilibrium (NLTE). For the first time, we use realistic 3D NLTE calculations of Fe for a quantitative comparison to solar observations. We confront our theoretical line profiles with observations taken at different viewing angles across the solar disc with the Swedish 1-m Solar Telescope. We find that 3D modelling well reproduces the observed centre-to-limb behaviour of spectral lines overall, but highlight aspects that may require further work, especially cross-sections for inelastic collisions with electrons. Our inferred solar iron abundance is log(epsilon(Fe)) = 7.48 +/- 0.04 dex.
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Amarsi, A. M.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany.;Australian Natl Univ, Res Sch Astron & Astrophys, Cotter Rd, Canberra, ACT 2611, Australia.
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Asplund, M.Australian Natl Univ, Res Sch Astron & Astrophys, Cotter Rd, Canberra, ACT 2611, Australia.
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Barklem, Paul S.Uppsala universitet,Observationell astrofysik(Swepub:uu)pba11670
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Bautista, M.Western Michigan Univ, Dept Phys, Kalamazoo, MI 49008 USA.
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Bergemann, M.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany.
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Collet, R.Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark.
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Kiselman, DanStockholms universitet,Institutionen för astronomi(Swepub:su)dan
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Leenaarts, JorritStockholms universitet,Institutionen för astronomi(Swepub:su)jleen
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Pereira, T. M. D.Univ Oslo, Inst Theoret Astrophys, POB 1029, N-0315 Oslo, Norway.
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Uppsala universitetObservationell astrofysik
(creator_code:org_t)
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In:Monthly notices of the Royal Astronomical Society: OXFORD UNIV PRESS468:4, s. 4311-43220035-87111365-2966
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Lind, Karin
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Amarsi, A. M.
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Asplund, M.
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Barklem, Paul S.
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Bautista, M.
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Bergemann, M.
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Collet, R.
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Kiselman, Dan
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Leenaarts, Jorri ...
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Pereira, T. M. D ...
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NATURAL SCIENCES
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NATURAL SCIENCES
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Uppsala University
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Stockholm University