The Hyper-MUCHFUSS project: probing the Galactic halo with sdB stars A. Tillich, U. Heber, S. Geier, H. Hirsch, P. F. L. Maxted, B. T. Gänsicke, T. R. Marsh, R. Napiwotzki, R. H. Østensen and R.-D. Scholz A&A, 527 (2011) A137 Published online: 11 February 2011 DOI: 10.1051/0004-6361/201015539