4922 20200614180244.0 CTALK-2020-0123 Lobel, Alex The Belgian Repository of fundamental Atomic data and Stellar Spectra 2019 2019-11-27 BRASS is an international networking project for the development of a new public database providing accurate fundamental atomic data of vital importance for stellar spectroscopic research. We present an overview of research results obtained over the past years. The BRASS database offers atomic line data we thoroughly tested by comparing theoretical and observed stellar spectra. We perform extensive quality assessments of selected atomic input data using advanced radiative transfer spectrum synthesis calculations, which we compare to high-resolution Mercator-HERMES and ESO-VLT-UVES spectra of FGK benchmark stars observed with very high signal-to-noise ratios. \\ We have retrieved about half a million atomic lines required for our detailed spectrum synthesis calculations from the literature and online databases such as VAMDC, NIST ADS, VALD3, CHIANTI, Spectr-W3 , TIP/TOPBASE, SpectroWeb. The atomic datasets have been cross-matched based on line electronic configuration information and organized in a new online repository at brass.sdf.org [1]. The validated atomic data, combined with the observed and theoretical spectra are also interactively offered in BRASS [2]. The combination of these datasets is a novel approach for its development providing a universal reference for advanced stellar spectroscopic research. We present an overview of the BRASS Data Interface developments allowing online user interaction for the combined spectrum and atomic data display, line identification, atomic data accuracy assessments including line log(gf)-values [3], and line equivalent width measurements. References: [1] Laverick, M., Lobel, A., Merle, T., et al., Astronomy & Astrophysics, 612 (2018) A60. [2] Lobel, A., Royer, P., Martayan, C., et al., Can. Journal of Physics, 95 (2017) 833. [3] Laverick, M., Lobel, A., Royer, P., et al., Astronomy & Astrophysics, 624 (2019) A60. BR/ 143/ A2/BRASS NO Computational Atomic and Nuclear Structures for Nuclear, Plasma and Astrophysics The BRASS Team, - Solvay Workshop on "New Frontiers in Atomic, Nuclear, Plasma and Astrophysics", 25-27 Nov 2019, Univ. Libre de Bruxelles, Belgium alex.lobel@observatoire.be http://www.solvayinstitutes.be/event/workshop/new_frontiers_2019/new_frontiers_2019.html http://www.solvayinstitutes.be/event/workshop/new_frontiers_2019/slides_cts/Lobel.pdf Contributed CTALKCONT