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Pyrzas (Warwick), T. Liimets (Tartu, ULL)","submitted_at":"2010-06-05T22:28:10Z","abstract_excerpt":"We present time-resolved optical spectroscopy of V458 Vulpeculae (Nova Vul 2007 No. 1) spread over a period of 15 months starting 301 days after its discovery. Our data reveal radial velocity variations in the HeII {\\lambda}5412 and HeII {\\lambda}4686 emission lines. A period analysis of the radial velocity curves resulted in a period of 98.09647 \\pm 0.00025 min (0.06812255 \\pm 0.00000017 d) which we identify with the orbital period of the binary system. V458 Vul is therefore the planetary nebula central binary star with the shortest period known. 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