Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-02-17
Astrophys.J. 625 (2005) 838-848
Astronomy and Astrophysics
Astrophysics
31 pages, 8 figures, accepted for publication in the Astrophysical Journal
Scientific paper
10.1086/429715
A detailed analysis of 32 of the 38 halo white dwarf candidates identified by Oppenheimer et al. is presented, based on model atmosphere fits to observed energy distributions built from optical BVRI and infrared JHK CCD photometry. Effective temperatures and atmospheric compositions are determined for all objects, as well as masses and cooling ages when trigonometric parallax measurements are available. This sample is combined with that of other halo white dwarf candidates and disk white dwarfs to study the nature of these objects in terms of reduced proper motion diagrams, tangential velocities, and stellar ages. We reaffirm the conclusions of an earlier analysis based on photographic magnitudes of the same sample that total stellar ages must be derived in order to associate a white dwarf with the old halo population, and that this can only be accomplished through precise mass and distance determinations.
Bergeron Pierre
Currie Malcolm J.
Dufour Patrick
Hamuy Mario
Lajoie Charles-Philippe
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