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Non-local Thermodyn...
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Bergemann, MariaMax Planck Institute for Astronomy
(author)
Non-local Thermodynamic Equilibrium Stellar Spectroscopy with 1D and 〈3〉 Models. I. Methods and Application to Magnesium Abundances in Standard Stars
- Article/chapterEnglish2017
Publisher, publication year, extent ...
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2017-09-15
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American Astronomical Society,2017
Numbers
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LIBRIS-ID:oai:lup.lub.lu.se:3e57348a-9852-45da-99c2-4d83f27714e7
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https://lup.lub.lu.se/record/3e57348a-9852-45da-99c2-4d83f27714e7URI
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https://doi.org/10.3847/1538-4357/aa88cbDOI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
Notes
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We determine Mg abundances in six Gaia benchmark stars using theoretical one-dimensional (1D) hydrostatic model atmospheres, as well as temporally and spatially averaged three-dimensional (〈3D〉) model atmospheres. The stars cover a range of Teff from 4700 to 6500 K, log g from 1.6 to 4.4 dex, and [Fe H] from -3.0 dex to solar. Spectrum synthesis calculations are performed in local thermodynamic equilibrium (LTE) and in non-LTE (NLTE) using the oscillator strengths recently published by Pehlivan Rhodin et al. We find that: (a) Mg abundances determined from the infrared spectra are as accurate as the optical diagnostics, (b) the NLTE effects on Mg I line strengths and abundances in this sample of stars are minor (although for a few Mg I lines the NLTE effects on abundance exceed 0.6 dex in 〈3D〉 and 0.1 dex in 1D, (c) the solar Mg abundance is 7.56 ± 0.05 dex (total error), in excellent agreement with the Mg abundance measured in CI chondritic meteorites, (d) the 1D NLTE and 〈3D〉 NLTE approaches can be used with confidence to analyze optical Mg I lines in spectra of dwarfs and sub-giants, but for red giants the Mg I 5711 line should be preferred, (e) low-excitation Mg I lines are sensitive to the atmospheric structure; for these lines, LTE calculations with 〈3D〉 models lead to significant systematic abundance errors. The methods developed in this work will be used to study Mg abundances of a large sample of stars in the next paper in the series.
Subject headings and genre
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Collet, RemoAarhus University,Australian National University
(author)
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Amarsi, Anish M.Australian National University,Max Planck Institute for Astronomy
(author)
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Kovalev, MikhailMax Planck Institute for Astronomy
(author)
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Ruchti, GregLund University,Lunds universitet,Astronomi - Har omorganiserats,Institutionen för astronomi och teoretisk fysik - Har omorganiserats,Naturvetenskapliga fakulteten,Lund Observatory - Has been reorganised,Department of Astronomy and Theoretical Physics - Has been reorganised,Faculty of Science(Swepub:lu)astr-grh
(author)
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Magic, ZazraltNatural History Museum of Denmark,University of Copenhagen
(author)
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Max Planck Institute for AstronomyAarhus University
(creator_code:org_t)
Related titles
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In:Astrophysical Journal: American Astronomical Society847:10004-637X1538-4357
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