Erlangen 2018 – scientific programme
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A: Fachverband Atomphysik
A 33: Poster Session II
A 33.26: Poster
Wednesday, March 7, 2018, 16:15–18:15, Redoutensaal
VUV spectroscopy of highly charged ruthenium ions of astrophysical interest — Julia I. Jäger1, Leticia Täubert1, •Chintan Shah1, Lisa Loebling2, Klaus Werner2, and José Ramón Crespo López-Urrutia1 — 1Max-Plank-Institut für Kernphysik, Heidelberg, Germany — 2Eberhard Karls Universität, Tübingen, Germany
The discovery of technetium in the atmospheres of red giants constituted convincing proof that s-process nucleosynthesis is indeed occurring in evolved stars. The presence of Tc in the immediate progenitor stars can be an outstanding indicator for recent nucleosynthesis. However, the main obstacle for using Tc as an indicator is the lack of experimental as well as theoretical atomic data for high ionization stages [1, 2]. Since radioactive nature of Tc imposes a technical challenge in our experiment for now, as a first step, we decided to investigate the neighboring Ru (Z=44) ions assuming their atomic structures are the same. Using electron beam ion trap, we generated Ru4+..6+ ions and emitted vacuum ultraviolet fluorescence was measured with 3-meter normal-incidence-monochromator. Some of the VUV lines are identified by the use of Flexible Atomic Code [3]. We further plan to implement these data in non-LTE model-atmosphere simulations computing stellar spectra that can finally be compared to ultraviolet observations obtained with space-based UV telescopes.[1] K. Werner et al., ApJL, 753, L7 (2012) [2] K. Werner et al., A&A, 574, A29 (2015) [3] M. Gu, CJP, 86, 5 (2008).