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We use photoionization modeling to assess the binary nature of the centralstars of NGC 2392 and NGC 6026. If they are close binaries, they are potentialType Ia supernova (SN Ia) progenitors if the total mass exceeds theChandrasekhar limit. We show that the nucleus of NGC 2392 likely has a hot,massive (\simeq 1 Ms) white dwarf companion, and a total mass of ~ 1.6 Ms,making it an especially interesting system. The binary mass in NGC 6026 isless, ~ 1.1 Ms. Even though its orbital period is short, it is not consideredto be a SN Ia progenitor.

A search for Type Ia supernova progenitors: the central stars of the planetary nebulae NGC 2392 and NGC 6026