Abstract

Atomic line opacities play a crucial role in stellar astrophysics. However, very few parameters of atomic transitions were actually measured in the laboratory and most of the lines were calculated with low precision atomic parameters. Only a small part of the lines were calibrated empirically. These calibrations are generally done manually for a small subset of lines. For the purpose of computing a complete stellar grid with a good range of atmospheric parameters, this situation is rather limiting. We have implemented an innovative method to perform this calibration in a more robust and ecient way called ALiCCE: Atomic Lines Calibration using the Cross-Entropy algorithm. Here we present the adaptation of the method to the calibration of atomic lines used by spectral synthesis codes. This is done using synthetic models of high quality. We show here that the method is extremely ecient for calibration of line lists and can be used to do that using high quality spectra of real stars.