A potential ϕ Per-type (Be+sdO) binary: FY CMa Th. Rivinius, S. Štefl, M. Maintz, O. Stahl and D. Baade A&A, 427 1 (2004) 307-311 Published online: 25 October 2004 DOI: 10.1051/0004-6361:20041161