Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...472l..43b&link_type=abstract
Astronomy and Astrophysics, Volume 472, Issue 3, September IV 2007, pp.L43-L46
Astronomy and Astrophysics
Astrophysics
18
Atomic Data, Line: Identification, Methods: Laboratory, Sun: Abundances
Scientific paper
Context: The solar photospheric element abundances are generally in good agreement with the meteoritic CI chondrite abundances, with the exception of a small number of elements including manganese. The solar photospheric abundances, determined using model atmospheres, include laboratory oscillator strengths where available. However, the current laboratory database for Mn i oscillator strengths is derived from several different laboratory observations determined from several different laboratory techniques. The uncertainty in the solar photospheric manganese abundance and the difference between it and the meteoritic CI chondrite abundance may just be an artefact of inaccurate laboratory data. Aims: The aim of our new laboratory measurements is to measure a self consistent set of accurate absolute oscillator strengths and use the new laboratory data to re-evaluate the solar manganese abundance. Methods: New and more accurate oscillator strengths have been determined by combining branching fractions with previously measured energy level lifetimes. Using the new laboratory data, the solar photospheric abundance of manganese has been determined with theoretical and semi-empirical model atmospheres, MAFAGS-ODF and Holweger & Müller, respectively. Results: We present experimental oscillator strengths for 94 Mn i transitions covering the wavelength range 2384 to 17 744 Å. Using 22 relatively un-blended solar Mn i transitions, we determine the photospheric abundance of manganese to be log\varepsilon&sun; = 5.37 ± 0.05 dex. Conclusions: The new value is in good agreement with previous photospheric abundance determinations. The implications for the solar photospheric and meteoritic CI chondrite abundance is discussed.
Research supported by the International Max Planck Research School(IMPRS), Munich, Germany. Full Table 1 is only available at http://www.aanda.org
Bergemann Maria
Blackwell-Whitehead Richard
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