S. Friedrich et al., OBSERVATION OF FLUX AND CIRCULAR-POLARIZATION SPECTRA OF WHITE-DWARFSWITH LOW MAGNETIC-FIELDS, Astronomy and astrophysics, 309(1), 1996, pp. 227-234
We present flux and circular polarization spectra for three magnetic w
hite dwarfs - PG 1658+441, PG 0136+251, KW 2316+123 - with magnetic fi
eld strengths between 130 Tesla and 3500 Tesla. In this magnetic field
range line profiles are strongly influenced by electric fields of abo
ut 10(7) V/m present in the dense atmospheres of white dwarfs. Taking
these strong electric fields into account we calculate model spectra t
o compare them with observed spectra. It could be shown that line broa
dening due to electric and magnetic fields is sufficient to explain th
e broad line profiles of PG 1658+441 and PG 0136+251.