EROS 2 proper motion survey for halo white dwarfs

Details EROS 2 proper motion survey for halo white dwarfs EROS 2 proper motion survey for halo white dwarfs

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.4407g&link_type=abstract

American Astronomical Society, 200th AAS Meeting, #44.07; Bulletin of the American Astronomical Society, Vol. 34, p.713

Astronomy and Astrophysics

Astronomy

Scientific paper

In 1996 EROS 2 launched a proper motion survey, in order to detect massive compact objects that may compose the Galactic halo. We observed 350 square degrees with 3 or more epochs, using the EROS 2 two-color wide field imager. With sensitivity down to I=20.5mag and V=21.5mag, and proper motion errors in the order of 0.05"/yr for bright stars, up to 0.15"/yr for the faintest stars, we are able to detect faint halo white dwarfs of the Solar neighbourhood, as well as fast, cool disk objects, such as brown dwarfs. In this paper we present the results of our survey regarding the composition of the Galactic halo in cool white dwarfs. We found no candidates in a 5500pc3 effective volume for old, fast MV=17 white dwarfs. 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 14 Gyr halo composed of white dwarfs, as modeled by Chabrier (1999).

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