Farihi, J;
(2004)
Discovery of an Ultracool White Dwarf Companion.
The Astrophysical Journal
, 610
(2)
pp. 1013-1020.
10.1086/382682.
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Abstract
The discovery of a low-luminosity common proper-motion companion to the white dwarf GD 392 at a wide separation of 46'' is reported. BVRI photometry suggests a low temperature (Teff ~ 4000 K), while JHK data strongly indicate suppressed flux at all near-infrared wavelengths. Thus, GD 392B is one of the few white dwarfs to show significant collision-induced absorption due to the presence of photospheric H2 and the first ultracool white dwarf detected as a companion to another star. Models fail to explain GD 392B as a normal-mass white dwarf. If correct, the cool companion may be explained as a low-mass white dwarf or unresolved double degenerate. The similarities of GD 392B to known ultracool degenerates are discussed, including some possible implications for the faint end of the white dwarf luminosity function.
| Type: | Article |
|---|---|
| Title: | Discovery of an Ultracool White Dwarf Companion |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1086/382682 |
| Publisher version: | http://dx.doi.org/10.1086/382682 |
| Language: | English |
| Additional information: | Copyright © 2004. The American Astronomical Society. All rights reserved. |
| Keywords: | binaries: general; stars: fundamental parameters; stars: individual (GD 392); white dwarfs |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1477416 |
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