Extreme abundance ratios in the polluted atmosphere of the cool white dwarf NLTT 19868

0462790 - ASÚ 2017 RIV GB eng J - Journal Article
Kawka, Adela - Vennes, Stephane
Extreme abundance ratios in the polluted atmosphere of the cool white dwarf NLTT 19868.
Monthly Notices of the Royal Astronomical Society. Roč. 458, č. 1 (2016), s. 325-331. ISSN 0035-8711. E-ISSN 1365-2966
Institutional support: RVO:67985815
Keywords : diffusion * stars * abundances
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics
Impact factor: 4.961, year: 2016

We present an analysis of intermediate-dispersion spectra and photometric data of the newly identified cool, polluted white dwarf NLTT 19868. The spectra obtained with X-shooter on the Very Large Telescope-Melipal show strong lines of calcium, and several lines of magnesium, aluminium and iron. We use these spectra and the optical-to-near-infrared spectral energy distribution to constrain the atmospheric parameters of NLTT 19868. Our analysis shows that NLTT 19868 is iron poor with respect to aluminium and calcium.
Permanent Link: http://hdl.handle.net/11104/0262178