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Issue A&A
Volume 497, Number 2, April II 2009
Page(s) 611 - 617
Section Atomic, molecular, and nuclear data
DOI http://dx.doi.org/10.1051/0004-6361/200811508
Published online 05 March 2009

A&A 497, 611-617 (2009)
DOI: 10.1051/0004-6361/200811508

Both accurate and precise gf-values for Fe  II lines

J. Meléndez1 and B. Barbuy2

1  Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
    e-mail: jorge@astro.up.pt
2  Universidade de São Paulo, IAG, Rua do Matão 1226, Cidade Universitária, São Paulo 05508-900, Brazil

Received 11 December 2008 / Accepted 28 January 2009

Abstract
We present a new set of oscillator strengths for 142 $\ion{Fe}{ii}$ lines in the wavelength range 4000–8000 Å. Our gf-values are both accurate and precise, because each multiplet was globally normalized using laboratory data (accuracy), while the relative gf-values of individual lines within a given multiplet were obtained from theoretical calculations (precision). Our line list was tested with the Sun and high-resolution ( $R \approx 10^5$), high-S/N ($\approx$700–900) Keck+HIRES spectra of the metal-poor stars HD 148816 and HD 140283, for which line-to-line scatter ($\sigma$) in the iron abundances from $\ion{Fe}{ii}$ lines as low as 0.03, 0.04, and 0.05 dex are found, respectively. For these three stars the standard error in the mean iron abundance from $\ion{Fe}{ii}$ lines is negligible ( $\sigma_\mathrm{mean} \leq 0.01$ dex). The mean solar iron abundance obtained using our gf-values and different model atmospheres is $A_{\rm Fe} = 7.45 (\sigma = 0.02$).


Key words: Sun: abundances -- Sun: photosphere -- stars: abundances -- atomic data



© ESO 2009


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