Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The fraction of DA white dwarfs with kilo-Gauss magnetic fields   Weak magnetic field has been searched for on only a small number of white
dwarfs. Current estimates for white dwarfs with fields in excess of 1MG are
about 10%; according to previous studies this number increases up to about 25%
in the kG regime.
  Our aim is to improve the statistics by a new sample of ten white dwarfs in
order to determine the ratio of magnetic to field-free white dwarfs.
  Mean longitudinal magnetic fields strengths were determined by means of
high-precision circular polarimetry of Hbeta and Hgamma with the FORS1
spectrograph of the VLT ``Kueyen'' 8 m telescope.
  In one of our objects (LTT 7987) we detected a statistically significant (97%
confidence level) longitudinal magnetic field varying between (-1+-0.5$)kG and
(+1+-0.5)kG. This would be the weakest magnetic field ever found in a white
dwarf, but at this level of accuracy, systematic errors cannot completely be
ruled out. We also observed the sdO star EC11481-2303 but could not detect a
magnetic field.
  VLT observations with uncertainties of typically 1000 G or less suggest that
15-20% of WDs have kG fields. Together with previous investigations, the
fraction of kG magnetic fields in white dwarfs amounts to about 11-15%, which
is close to the current estimations for highly magnetic white dwarfs (>1MG).

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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: eess
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The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: physics
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The categories of this paper are: cond-mat
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: q-fin