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Institut für Astronomie und Astrophysik

Abteilung Astronomie

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Preprint 14/11

IrOnIc: How to Consider Hundreds of Millions of Iron-Group Lines in NLTE Model-Atmosphere Calculations

Ellen Ringat

Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle
Physics, Eberhard Karls University, Sand 1, D-72076 Tübingen, Germany

To be published in: ASP CS proceedings of ADASS XXI

Abstract. Iron-group elements have a very high number of atomic levels and an overwhelming number of spectral lines. No NLTE model-atmosphere code can cope with these in a classical way. A statistical approach was developed over the last decade to decrease the number of levels and lines to a manageable amount. The Iron Opacity and Interface (IrOnIc) calculates sampled cross-sections and model-atom files as input for model-atmosphere computations. IrOnIc is presently transferred into a parallelized code to reduce the calculation time to a reasonable value. It will be accessible by the public as a service of the German Astrophysical Virtual Observatory.

Preprint (184 kb PDF file including figures)
Astrophysics (astro-ph): 1111.5740

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