OBSERVATION OF FLUX AND CIRCULAR-POLARIZATION SPECTRA OF WHITE-DWARFSWITH LOW MAGNETIC-FIELDS

Authors
FRIEDRICH S OSTREICHER R SCHWEIZER W
Citation
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
Citations number
24
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Astronomy and astrophysics → ACNP
ISSN journal
00046361
Volume
309
Issue
1
Year of publication
1996
Pages
227 - 234
Database
ISI
SICI code
0004-6361(1996)309:1<227:OOFACS>2.0.ZU;2-P
Abstract
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.