Volume 400, Number 1, March II 2003
|Page(s)||L13 - L16|
|Published online||24 February 2003|
Letter to the Editor
Model atmosphere analysis of the extreme DQ white dwarf GSC2U J131147.2+292348
INAF, Osservatorio Astronomico di Torino, 10025 Pino Torinese, Italy
2 Institut für Theoretische Physik und Astrophysik, Universität Kiel, 24098 Kiel, Germany
3 Cambridge Astronomical Survey Unit, Institute of Astronomy, Madingley Road, Cambridge, CB3 0HA, UK
Corresponding author: D. Carollo, firstname.lastname@example.org
Accepted: 28 January 2003
A new model atmosphere analysis for the peculiar DQ white dwarf discovered by Carollo et al. ([CITE]) is presented. The effective temperature and carbon abundance have been estimated by fitting both the photometric data () and a low resolution spectrum ( Å) with a new model grid for helium-rich white dwarfs with traces of carbon (DQ stars). We estimate K and , which make GSC2U J131147.2+292348 the coolest DQ star ever observed. This result indicates that the hypothetical transition from C2 to C2H molecules around = 6000 K, which was inferred to explain the absence of DQ stars at lower temperatures, needs to be reconsidered.
Key words: white dwarfs / techniques: spectroscopic / stars: kinematics / stars: individual: GSC2U J131147.2+292348
© ESO, 2003
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