EROS 2 proper motion survey: Constraints on the halo white dwarfs
B. Goldman, C. Afonso, Ch. Alard, J. -N. Albert, A. Amadon, J. Andersen, R. Ansari, E. Aubourg, P. Bareyre, F. Bauer, J. -Ph. Beaulieu, G. Blanc
Abstract
We are conducting a 377-square-degree 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 square degrees for which we possess three epochs, and applying selection criteria designed to isolate halo-type objects, we find no candidates in a 5500 pc3 effective volume for old, fast MV=17 white dwarfs. We check the detection efficiency 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=17 and 1<V-I<1.5. The same conclusion applies to a 14Gyr halo composed of white dwarfs with hydrogen atmosphere, as modeled by Chabrier (99).
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