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

Ellen Ringat (Institute for Astronomy and Astrophysics)

Abstract

The iron-group elements (Ca-Ni) have a very high number of atomic levels and an overwhelming number of spectral lines. No NLTE model-atmosphere code can cope with these levels and lines in a classical way. In order to decrease the number of levels and lines to a manageable number, a statistical approach was developed over the last decade. The Iron Opacity and Interface (IrOnIc) code calculates sampled cross-sections and model-atom files as input for model-atmosphere calculations.
IrOnIc is presently transferred into a parallelized code, using MPI as well as GPU (CUDA) techniques. This will strongly reduce the calculation time to a reasonable value.
IrOnIc will be made accessible to the public as a service of the German Astrophysical Virtual Observatory.
We present the current state of this project as well as future developments.

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Paper ID: P129

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