4920 20220906140455.0 10.48550/arXiv.1712.07678 DOI SCART-2020-0120 Lobel, A. The Belgian Repository of fundamental Atomic data and Stellar Spectra. Final Report. 2020 Project Summary in English, French, and Dutch language also available at https://www.belspo.be/belspo/brain-be/themes_2_GeoUniClim_nl.stm#BRASS Accurate atomic line transition data are fundamental input parameters in astrophysics. Spectrum synthesis calculations are of central importance for the development of complex models that describe, analyse and explain stars and planets, their internal structures, atmospheres, and evolution in relation to their environments. Uncertainties and errors in adopted fundamental atomic data may systematically propagate throughout all fields of astrophysics, from star-planet formation to large-scale galactic evolution. It is very difficult to obtain accurate fundamental atomic data of astrophysical interest from laboratory measurements. There are only a limited number of repositories that offer these important atomic data values. The atomic repositories are often complementary rather than redundant, and can provide incomplete or inaccurate information. Important quality assessments of the provided atomic data values are scarce (and mostly absent), which very much complicates the validation of results that follow from their application. BR/ 143/ A2/BRASS NO Atomic transition data Stars Spectroscopy Spectral lines Databases Royer, P. Martayan, C. Laverick, M. van Hoof, P.A.M. Merle, T. Van der Swaelmen, M. David, M. Hensberge, H. Thienpont, E. Belgian Science Policy Office 2020 BRAIN-be - Belgian Research Action through Interdisciplinary Networks 2012-2017 2020 1-57 alex.lobel@observatoire.be https://www.belspo.be/belspo/brain-be/themes_2_GeoUniClim_nl.stm#BRASS published in REFERD