Discovery of a peculiar DQ white dwarf

Details Discovery of a peculiar DQ white dwarf Discovery of a peculiar DQ white dwarf

2002-08-27

arxiv.org/abs/astro-ph/0208479v1

Astron.Astrophys. 393 (2002) L45-L48

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A Letters, 4 pages, 2 figures

Scientific paper

10.1051/0004-6361:20021130

We report the discovery of a new carbon rich white dwarf that was identified during a proper motion survey for cool white dwarfs based on photographic material used for the construction of the Guide Star Catalog II. Its large proper motion (0.48 arcsec/yr) and faint apparent magnitude (V = 18.7) suggest a nearby object of low luminosity. A low-resolution spectrum taken with the William Herschel Telescope clearly shows strong C2 Deslandres-d'Azambuja and Swan bands, which identify the star as a DQ white dwarf. The strength of the Deslandres-d'Azambuja bands and the depression of the continuum in the Swan-band region are signs of enhanced carbon abundance for the given Teff. Comparison of our spectrophotometric data to published synthetic spectra suggests 6000 K < Teff < 8000 K although further analysis with specialized synthetic models appear necessary to derive both Teff and chemical composition. Finally, the range of spatial velocity estimated for this object makes it a likely member of the halo or thick disk population.

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