The polluted atmospheres of cool white dwarfs and the magnetic field connection

0429445 - ASÚ 2015 RIV GB eng J - Journal Article
Kawka, Adela - Vennes, Stephane
The polluted atmospheres of cool white dwarfs and the magnetic field connection.
Monthly Notices of the Royal Astronomical Society. Roč. 439, č. 1 (2014), L90-L94. ISSN 0035-8711. E-ISSN 1365-2966
R&D Projects: GA ČR GAP209/12/0217; GA ČR GA13-14581S
Institutional support: RVO:67985815
Keywords : white dwarfs * stars: abundances * stars: atmospheres
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics
Impact factor: 5.107, year: 2014

We present an analysis of X-Shooter spectra of the polluted hydrogen-rich white dwarfs (DAZ) NLTT 888 and NLTT 53908. The spectra of NLTT 53908 show strong, Zeeman-split calcium lines (Ca II H&K and Ca I lambda 4226) and the star appears to be a close relative of the polluted magnetic white dwarf (DAZH) NLTT 10480, while the spectra of NLTT 888 show narrow lines of calcium and iron. A comparison of the DAZ NLTT 888 and the DAZH NLTT 53908 with other class members illustrates the diversity of environment and formation circumstances surrounding these objects. In particular, we find that the incidence of magnetism in old, polluted white dwarfs significantly exceeds that found in the general white dwarf population which suggests a hypothetical link between a crowded planetary system and magnetic field generation.
Permanent Link: http://hdl.handle.net/11104/0234567