Radiative decay of the 4d5(6S)5p z5,7Po states in Tc ii: comparison along the homologous and isoelectronic sequences. Application to astrophysics |
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| Authors: | P Palmeri P Quinet É Biémont A V Yushchenko A Jorissen S Van Eck |
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| Institution: | Astrophysique et Spectroscopie, Universitéde Mons-Hainaut, 7000 Mons, Belgium;IPNAS, Bât. B15, Universitéde Liège, Sart Tilman 4000 Liège, Belgium;Astronomical Observatory, Odessa National University, Parc Shevchenko, Odessa 65014, Ukraine;Astronomical Research Center for the Structure and Evolution of the Cosmos, Sejong University, Seoul, 143-747, South Korea;Institut d'Astrophysique, UniversitéLibre de Bruxelles, 1050 Bruxelles, Belgium |
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| Abstract: | Using three independent theoretical approaches (CA, HFR + CP, AUTOSTRUCTURE), oscillator strengths have been calculated for a set of Tc ii transitions of astrophysical interest and the reliability of their absolute scale has been assessed. The examination of the spectra emitted by some Ap stars has allowed the identification of Tc ii transitions in HD 125248. This Tc ii detection should however await confirmation from spectral synthesis relying on dedicated model atmospheres. New partition functions are also provided for Tc i , Tc ii and Tc iii for temperatures ranging between 4000 and 13 000 K. |
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| Keywords: | atomic data atomic processes line: identification stars: AGB and post-AGB stars: chemically peculiar |
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