Manganese Abundances In Three Metal-poor Stars Using Improved log(gf) Data For Mn I And Mn II Lines

Details Manganese Abundances In Three Metal-poor Stars Using Improved log(gf) Data For Mn I And Mn II Lines Manganese Abundances In Three Metal-poor Stars Using Improved log(gf) Data For Mn I And Mn II Lines

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915203l&link_type=abstract

American Astronomical Society, AAS Meeting #219, #152.03

Astronomy and Astrophysics

Astronomy

Scientific paper

We present accurate Mn abundances for three very metal-poor stars using new log(gf) measurements [Den Hartog et al. 2011] for transitions of Mn I and Mn II spanning a wavelength range from 2300 to 6050 Å. The three metal-poor ([Fe/H] < -2.0) program stars are HD 84937 (a warm main sequence turn-off star), HD 122563 (a cool giant deficient in n-capture elements) and HD115444 (a cool giant with extreme enhancements of n-capture elements). Using approximately 20 transitions of Mn I and more than 10 transitions of Mn II we find for each star a highly consistent abundance value, log ɛ(Mn) = 2.9 for HD 84937, log ɛ(Mn) = 1.6 for HD 115444, and log ɛ(Mn) = 1.9 for HD 122563, except for the resonance (E.P. = 0.0) multiplet of Mn I. This multiplet consistently yields lower abundance values with differences ranging from 0.3 dex for HD 84937 (a main sequence star) to 0.7 and 0.9 dex for the giant stars included in the study. We have critically examined aspects of radiative transfer for each of the Mn I and II transitions including depth of formation. Using estimates of the Fe abundances for these three well-studied metal-poor stars, we conclude that [Mn/Fe] = -0.70 ± 0.2 in the metalicity regime [Fe/H] = -2.5 ± 0.3.
Supported by NASA grant NNX09AL13G and NSF grants AST-0907732, AST-0908978, and AST-0707447.
Den Hartog, E A, Lawler J E, Sobeck J S, Sneden C, and Cowan J J 2011, ApJS 194, 35

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