Orbital properties of binary post-AGB stars Glenn-Michael Oomen, Hans Van Winckel, Onno Pols, Gijs Nelemans, Ana Escorza, Rajeev Manick, Devika Kamath and Christoffel Waelkens A&A, 620 (2018) A85 Published online: 04 December 2018 DOI: 10.1051/0004-6361/201833816