Manganese abundances in mercury—manganese stars

We use exact curve-of-growth analysis and spectral synthesis to deduce the abundance of Mn from high signal-to-noise ratio visible-region echelle spectra of selected Mn i and Mnii lines in 24 HgMn stars. The results are compared with the Mn abundances derived from UV resonance lines by Smith & D...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 1999-03, Vol.303 (3), p.555-564
Main Authors: Jomaron, C. M., Dworetsky, M. M., Allen, C. S.
Format: Article
Language:English
Subjects:
line: profiles
stars: abundances
stars: chemically peculiar
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Summary:We use exact curve-of-growth analysis and spectral synthesis to deduce the abundance of Mn from high signal-to-noise ratio visible-region echelle spectra of selected Mn i and Mnii lines in 24 HgMn stars. The results are compared with the Mn abundances derived from UV resonance lines by Smith & Dworetsky. We find excellent agreement for several unblended Mn lines and confirm the temperature dependence of the Mn abundance found by Smith & Dworetsky. The Mnii lines at ΛΛ 4206 and 4326 are much stronger than one would predict from the mean Mn abundances. The lack of agreement is greatest for stars with the strongest Mnii lines. Using ad hoc multicomponent fits to the profiles of sharp-lined stars, we show that most of the discrepancies can be explained by hyperfine structure that desaturates the lines, with full widths of the order of 0.06–0.09 Å.
ISSN:0035-8711
1365-2966
DOI:10.1046/j.1365-8711.1999.02252.x