High speed stars - III. Detailed abundances and binary nature of the extreme speed star GHS143 E. Caffau, P. Bonifacio, L. Monaco, L. Sbordone, M. Spite, P. François, P. Panuzzo, P. Sartoretti, L. Chemin, F. Thévenin and A. Mucciarelli A&A, 684 (2024) L4 Published online: 08 April 2024 DOI: 10.1051/0004-6361/202449485