Issue |
A&A
Volume 428, Number 2, December III 2004
|
|
---|---|---|
Page(s) | 451 - 458 | |
Section | Galactic structure, stellar clusters, and populations | |
DOI | https://doi.org/10.1051/0004-6361:20041080 | |
Published online | 26 November 2004 |
Disk or halo white dwarfs?
Kinematic analysis of high proper motion surveys
INAF - Osservatorio Astronomico di Torino, 10025 Pino Torinese, Italy e-mail: spagna@to.astro.it
Received:
13
April
2004
Accepted:
21
July
2004
We present an alternative method for the kinematic analysis of
high proper motion surveys and discuss its application to the
survey of Oppenheimer et al. (2001) for the selection of reliable
halo white dwarfs (WDs).
The local WD space density we estimate is pc-3, which is about an
order of magnitude smaller than the value derived in Oppenheimer
et al. (2001), and is consistent with the values obtained from
recent reanalyses of the same data.
Our result, which corresponds to a fraction of 0.1%
0.2%
of the local dark matter, does not support the scenario suggested
by microlensing experiments that ancient cool WDs could contribute
significantly to the dark halo of the Milky Way.
Key words: stars: kinematics / white dwarfs / dark matter / Galaxy: stellar content / surveys / methods: statistical
© ESO, 2004
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