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| Paper: |
Low Magnetic Fields in White Dwarfs and their Direct Progenitors? |
| Volume: |
469, 18th European White Dwarf Workshop (EUROWD12) |
| Page: |
411 |
| Authors: |
Jordan, S.; Bagnulo, S.; Landstreet, J.; Fossati, L.; Valyavin, G. G.; Monin, D.; Wade, G. A.; Werner, K.; O'Toole, S. J. |
| Abstract: |
We have carried out a re-analysis of polarimetric data of central stars of planetary nebulae, hot subdwarfs, and white dwarfs taken with FORS1 (FOcal
Reducer and
low dispersion Spectrograph)
on the VLT (Very Large Telescope), and added a large number of
new observations in order to increase the sample. A careful analysis of the observations using
only one wavelength calibration for the polarimetrically analysed
spectra and for all positions of the retarder plate of the spectrograph is crucial
in order to avoid spurious signals. We find that the previous detections of magnetic fields in subdwarfs and central stars could not be confirmed while
about 10% of the observed white dwarfs have magnetic fields
at the kilogauss level. |
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