The puzzling binary HD 143418 J. Zverko, J. Žižňovský, Z. Mikulášek, J. Krtička, I. Kh. Iliev, I. K. Stateva, I. I. Romanyuk and D. O. Kudryavtsev A&A, 506 2 (2009) 845-856 Published online: 27 August 2009 DOI: 10.1051/0004-6361/200912540