Hyperfine-dependent gf-values of Mn I Lines in the 1.49-1.80 μm H Band

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Hyperfine-dependent gf-values of Mn I Lines in the 1.49-1.80 μm H Band

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Publication Article, peer reviewed scientific
Title Hyperfine-dependent gf-values of Mn I Lines in the 1.49-1.80 μm H Band
Author(s) Andersson, Martin ; Grumer, Jon ; Ryde, Nils ; Blackwell-Whitehead, Richard ; Hutton, Roger ; Zou, Yaming ; Jönsson, Per ; Brage, Tomas
Date 2015
English abstract
The three Mn i lines at 17325, 17339, and 17349Å are among the 25 strongest lines (log(gf ) > 0.5) in the H band. They are all heavily broadened due to hyperfine structure, and the profiles of these lines have so far not been understood. Earlier studies of these lines even suggested that they were blended. In this work, the profiles of these three infrared (IR) lines have been studied theoretically and compared to experimental spectra to assist in the complete understanding of the solar spectrum in the IR. It is shown that the structure of these lines cannot be described in the conventional way using the diagonal A and B hyperfine interaction constants. The off-diagonal hyperfine interaction not only has a large impact on the energies of the hyperfine levels, but also introduces a large intensity redistribution among the hyperfine lines, changing the line profiles dramatically. By performing large-scale calculations of the diagonal and off-diagonal hyperfine interaction and the gf -values between the upper and lower hyperfine levels and using a semi-empirical fitting procedure, we achieved agreement between our synthetic and experimental spectra. Furthermore, we compare our results with observations of stellar spectra. The spectra of the Sun and the K1.5 III red giant star Arcturus were modeled in the relevant region, 1.73–1.74 μm, using our theoretically predicted gf -values and energies for each individual hyperfine line. Satisfactory fits were obtained and clear improvements were found using our new data compared with the old available Mn i data. A complete list of energies and gf -values for all the 3d54s(7S)4d e6D – 3d54s(7S)4f w6F hyperfine lines are available as supporting material, whereas only the stronger lines are presented and discussed in detail in this paper.
DOI http://dx.doi.org/10.1088/0067-0049/216/1/2 (link to publisher's fulltext)
Host/Issue The Astrophysical Journal Supplement Series;1
Volume 216
ISSN 0067-0049
Pages 1-9
Language eng (iso)
Subject(s) Sciences
Research Subject Categories::NATURAL SCIENCES
Handle http://hdl.handle.net/2043/18615 (link to this page)

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