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Open AccessArticle

The Belgian Repository of Fundamental Atomic Data and Stellar Spectra (BRASS)

Royal Observatory of Belgium, Ringlaan 3, B-1180 Brussels, Belgium
Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D, Box 2401, 3001 Leuven, Belgium
European Organisation for Astronomical Research in the Southern Hemisphere, Alonso de Córdova 3107, Vitacura, 19001 Casilla, Santiago de Chile, Chile
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, Av. Franklin Roosevelt 50, CP 226, 1050 Brussels, Belgium
Onderzoeksgroep Toegepaste Wiskunde, Universiteit Antwerpen, Middelheimlaan 1, 2020 Antwerp, Belgium
Vereniging voor Sterrenkunde, Kapellebaan 56, 2811 Leest, Belgium
Author to whom correspondence should be addressed.
Atoms 2019, 7(4), 105;
Received: 15 October 2019 / Accepted: 19 November 2019 / Published: 22 November 2019
Background: BRASS (Belgian Repository of Fundamental Atomic Data and Stellar Spectra) 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 in the past four years. Methods: 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 F-, G-, and K-type 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, VALD, CHIANTI, Spectr-W 3 , TIPbase, TOPbase, SpectroWeb. Results: The atomic datasets have been cross-matched based on line electronic configuration information and organized in a new online repository called BRASS. The validated atomic data, combined with the observed and theoretical spectra are also interactively offered in BRASS. The combination of these datasets is a novel approach for its development providing a universal reference for advanced stellar spectroscopic research. Conclusion: 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, and line equivalent width measurements. View Full-Text
Keywords: quantitative stellar spectroscopy; spectral lines; atomic line data; atomic and spectral databases quantitative stellar spectroscopy; spectral lines; atomic line data; atomic and spectral databases
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Lobel, A.; Royer, P.; Martayan, C.; Laverick, M.; Merle, T.; Van der Swaelmen, M.; van Hoof, P.A.M.; David, M.; Hensberge, H.; Thienpont, E. The Belgian Repository of Fundamental Atomic Data and Stellar Spectra (BRASS). Atoms 2019, 7, 105.

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