7451 20250128075916.0 10.1017/S1743921322002216 DOI SCART-2025-0082 Frost, A. J. HR 6819 - a post-interaction binary system originally thought to be a triple system containing a black hole 2024 In 2020, HR 6819 was reported to be a triple system containing the closest black hole to Earth. However, these results were contested, with an alternative explanation of a post-interaction binary suggested. Using new integral field spectroscopic and interferometric data, we have been able to determine the true nature of this exotic source. NO Bodensteiner, J. Rivinius, T. Baade, D. Merand, A. Selman, F. Abdul-Masih, M. Banyard, G. Bordier, E. Dsilva, K. Hawcroft, C. Mahy, L. Reggiani, M. Shenar, T. Cabezas, M. Hadrava, P. Heida, M. Klement, R. Sana, H. Massive Stars Near and Far, Edited by J. Mackey, J.S. Vink and N. St-Louis. Proceedings of the International Astronomical Union, held 8-13 May 2022 in Ballyconnell, Ireland. Cambridge University Press, 2024 361 2024 307-310 laurent.mahy@ksb-orb.be 434158 http://publi2-as.oma.be/record/7451/files/Frost_IAU361.pdf 19017 http://publi2-as.oma.be/record/7451/files/Frost_IAU361.gif?subformat=icon icon 23310 http://publi2-as.oma.be/record/7451/files/Frost_IAU361.jpg?subformat=icon-180 icon-180 published in NONREF