An ancient F-type subdwarf from the halo crossing the Galactic plane R.-D. Scholz, U. Heber, C. Heuser, E. Ziegerer, S. Geier and F. Niederhofer A&A, 574 (2015) A96 Published online: 30 January 2015 DOI: 10.1051/0004-6361/201425471