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Radiative decay of the 4d5(6S)5p z 5,7Po states in Tc II: Comparison along the homologous and isoelectronic sequences. Application to astrophysics

par Palmeri, Patrick;Quinet, Pascal;Biémont, Emile;Yushchenko, Alexander;Jorissen, Alain ;Van Eck, Sophie
Référence Monthly notices of the Royal Astronomical Society, 374, 1, page (63-71)
Publication Publié, 2007-01

Article révisé par les pairs

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Résumé :

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. © 2006 The Authors.