Double degenerates from the supernova Ia progenitor survey (SPY)

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We report on follow-up observations of double degenerate (DD) white dwarfs from the Supernovae Ia Progenitor Survey (SPY). Orbital parameters of four systems, including a massive short period system, are presented.
in: "White Dwarfs", Proc. XIII Workshop on White Dwarfs, eds. D. de Martino, R. Kalytis, R. Silvotti, J.E. Solheim, Kluwer, in press 4 pages, 1 figure

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