Manganese abundances in mercury-manganese stars

Details Manganese abundances in mercury-manganese stars Manganese abundances in mercury-manganese stars

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.303..555j&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 303, Issue 3, pp. 555-564.

Astronomy and Astrophysics

Astronomy

32

Line: Profiles, Stars: Abundances, Stars: Chemically Peculiar

Scientific paper

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 lambda lambda 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 A.

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