Monthly Notices of the Royal Astronomical Society: Letters
We report on the discovery of a new heavily polluted white dwarf. The DAZ white dwarf GALEX J193156.8+011745 was identified in a joint Galaxy Evolution Explorer (GALEX)/GSC survey of ultraviolet-excess objects. Optical spectra obtained at ESO New Technology Telescope show strong absorption lines of magnesium and silicon, and a detailed abundance analysis based on Very Large Telescope-Kueyen UVES spectra reveal super-solar abundances of silicon and magnesium and near-solar abundances of oxygen, calcium and iron. The overall abundance pattern bears the signature of on-going accretion on to the white dwarf atmosphere. The infrared spectral energy distribution shows an excess in the H and K bands likely associated with the accretion source.
Vennes, Stephane; Kawka, Adéla; and Németh, Péter, "The Heavily Polluted Atmosphere Of The DAZ White Dwarf GALEX J193156.8+011745" (2010). Aerospace, Physics, and Space Science Faculty Publications. 169.