"The Heavily Polluted Atmosphere Of The DAZ White Dwarf GALEX J193156.8" by Stephane Vennes, Adéla Kawka et al.
 

Document Type

Article

Publication Title

Monthly Notices of the Royal Astronomical Society: Letters

Abstract

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.

DOI

10.1111/j.1745-3933.2010.00830.x

Publication Date

2010

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