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PN G135.9+55.9 is the most metal-poor PN known in our Galaxy. The centralstar resides in a short-period binary system with a compact component, probablya white dwarf. We describe new observations, which allowed us to determine theorbital period. The lower limit for the combined mass of both stars is close tothe Chandrasekhar limit for white dwarfs, making this binary a possibleprogenitor of a supernova type Ia. The binary system must have recently emergedfrom a common envelope phase.Comment: Proceedings of the conference "Planetary Nebulae as Astronomical  Tools", Gdansk, June/July 2005. To appear in AIP conference serie

On the most metal-poor PN and its binary central star