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Title:
An ultra-cool white dwarf serendipitously found with COMBO-17
Authors:
Wolf, C.
Affiliation:
AA(Department of Physics, Denys Wilkinson Bldg., University of Oxford, Keble Road, Oxford, OX1 3RH, UK )
Publication:
Astronomy and Astrophysics, Volume 444, Issue 2, December III 2005, pp.L49-L52 (A&A Homepage)
Publication Date:
12/2005
Origin:
EDP Sciences
Astronomy Keywords:
stars: individual: COMBO-17 J1143, white dwarfs
DOI:
10.1051/0004-6361:200500207
Bibliographic Code:
2005A&A...444L..49W

Abstract

We report the discovery of an ultra-cool white dwarf in the COMBO-17 survey. So far, only seven objects have been discovered in this rare category of white dwarfs, which are characterized by strong flux depression in the far-red and near-infrared part of the spectrum, presumably due to collisionally induced absorption (CIA). The new object COMBO-17 J114356.08-0144032 has very similar colours to LHS 3250, which was the first of its kind to be recognized. However, at R=21.5 it is the faintest and possibly most distant such object discovered to date. It is the only such object in COMBO-17 at R<23; due to the small sky coverage of 0.78 square ° this chance discovery can not provide any constraints on the abundance of faint ultra-cool white dwarfs. We speculate on the basis of the proper motion that this new object is probably a member of the Galactic (thin) disk.
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