Kilo-gauss Magnetic Fields in three DA White Dwarfs

Details Kilo-gauss Magnetic Fields in three DA White Dwarfs Kilo-gauss Magnetic Fields in three DA White Dwarfs

2005-01-11

arxiv.org/abs/astro-ph/0501191v1

Astronomy and Astrophysics

Astrophysics

6 pages, 1 figure, in White Dwarfs, eds.D.,Koester, S.Moehler, ASP Conf.Series, p. 159

Scientific paper

We have detected longitudinal magnetic fields between 2 and 4kG in three normal DA white dwarfs (WD0446-790, WD1105-048, WD2359$-$434) out of a sample of 12 by using optical spectropolarimetry done with the VLT Antu 8 m telescope equipped with FORS1. With the exception of 40 Eri B (4kG) these are the first positive detections of magnetic fields in white dwarfs below 30kG. A detection rate of 25% (3/12) may indicate now for the firsttime that a substantial fraction of white dwarfs have a weak magnetic field.This result, if confirmed by future observations, would form a cornerston for our understanding of the evolution of stellar magnetic fields.

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