Abstract
We are conducting a 377 2 proper motion survey in the V and I bands in order to determine the cool white dwarf contribution to the Galactic dark matter. Using the 250 2 for which we possess three epochs, and applying selection criteria designed to isolate halo-type objects, we nd no candidates in a 5500 pc 3 eective volume for old, fast MV = 17 white dwarfs. We check the detection eciency by cross-matching our catalogue with Luyten's NLTT catalogue. The halo white dwarf contribution cannot exceed 5% (95% C.L.) for objects with MV =1 7 and 1 V I 1:5. The same conclusion applies to a 14 Gyr halo composed of white dwarfs with hydrogen atmosphere, as modeled by Chabrier.
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