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

0355102 - ASÚ 2011 RIV GB eng J - Článek v odborném periodiku
Vennes, Stephane - Kawka, Adela - Németh, Péter
The heavily polluted atmosphere of the DAZ white dwarf GALEX J193156.8+011745.
Monthly Notices of the Royal Astronomical Society. Roč. 404, č. 1 (2010), L40-L44. ISSN 0035-8711. E-ISSN 1365-2966
Grant CEP: GA AV ČR(CZ) IAA300030908; GA ČR GAP209/10/0967; GA MŠMT(CZ) LC06014
Grant ostatní: GA AV ČR(CZ) IAA301630901
Program: IA
Výzkumný záměr: CEZ:AV0Z10030501
Klíčová slova: GALEX J193156.8+011745 * white dwarfs
Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika
Impakt faktor: 4.888, rok: 2010

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.
Trvalý link: http://hdl.handle.net/11104/0193945