24 citations · 35 across the 13 of their papers we have counts for
12 papers · 1 filter
Kilo-gauss Magnetic Fields in three DA White Dwarfs
R. Aznar Cuadrado, S. Jordan, R. Napiwotzki +3
We have detected longitudinal magnetic fields between 2 and 4kG in three normal DA white dwarfs (WD0446-790, WD1105-048, WD2359434) out of a sample of 12 by using optical spectr…
Constraining Gravitational Theories by Observing Magnetic White Dwarfs
Oliver Preuss, Stefan Jordan, Mark P. Haugan +1
Under the assumption of a specific nonminimal coupling of torsion to Under the assumption of a specific nonminimal coupling of torsion to electromagnetism, spacetime is birefringen…
Gaia First Look
S. Jordan, U. Bastian, H. Lenhardt +3
A complicated and ambitious space mission like Gaia needs a careful monitoring and evaluation of the functioning of all components of the satellite. This has to be performed on dif…
Discovery of magnetic fields in CPNs
S. Jordan, K. Werner, S. J. O'Toole
For the first time we have directly detected magnetic fields in central stars of planetary nebulae by means of spectro-polarimetry with FORS1 at the VLT. In all four objects of our…
Do Magnetic Fields Prevent Hydrogen from Accreting onto Cool Metal-line White Dwarf Stars?
S. Friedrich, S. Jordan, D. Koester
It is generally assumed that metals detected in the spectra of a few cool white dwarfs cannot be of primordial origin and must be accreted from the interstellar medium. However, th…
Surface Magnetic Field Distributions of the White Dwarfs PG 1015+014 and HE 1045-0908
F. Euchner, S. Jordan, K. Reinsch +2
We have applied the method of Zeeman tomography to analyze the surface magnetic field structures of the white dwarfs PG 1015+014 and HE 1045-0908 from spin-phase resolved flux and…