The heavily polluted atmosphere of the DAZ white dwarf GALEX J193156.8+011745

Details The heavily polluted atmosphere of the DAZ white dwarf GALEX J193156.8+011745 The heavily polluted atmosphere of the DAZ white dwarf GALEX J193156.8+011745

2010-02-10

arxiv.org/abs/1002.2069v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Accepted for publication in MNRAS Letters

Scientific paper

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 GALEX/GSC survey of ultraviolet-excess objects. Optical spectra obtained at ESO NTT show strong absorption lines of magnesium and silicon and a detailed abundance analysis based on VLT-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 ongoing accretion onto the white dwarf atmosphere. The infrared spectral energy distribution shows an excess in the H and K bands likely associated with the accretion source.

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