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Manganese abundances in mercury-manganese stars

Jomaron, CM; Dworetsky, MM; Allen, CS; (1999) Manganese abundances in mercury-manganese stars. Monthly Notices of the Royal Astronomical Society , 303 (3) 555 - 564. 10.1046/j.1365-8711.1999.02252.x. Green open access

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Abstract

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.

Type: Article
Title: Manganese abundances in mercury-manganese stars
Open access status: An open access version is available from UCL Discovery
DOI: 10.1046/j.1365-8711.1999.02252.x
Publisher version: http://dx.doi.org/10.1046/j.1365-8711.1999.02252.x
Language: English
Additional information: © 1999 RAS Definitive versions of articles pre-2013 are available at http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966, now published by http://mnras.oxfordjournals.org
Keywords: manganese, mercury, stars
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/31896
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