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Title:
Spectropolarimetric Survey of Hydrogen-rich White Dwarf Stars
Authors:
Kawka, A.; Vennes, S.; Schmidt, G. D.; Wickramasinghe, D. T.; Koch, R.
Affiliation:
AA(Astronomický ústav AV ČR, CZ-251 65 Ondřejov, Czech Republic.; Division of Science and Engineering, Murdoch University, Perth, WA, Australia.), AB(Department of Physics and Space Sciences, Florida Institute of Technology, Melbourne, FL.), AC(Steward Observatory, University of Arizona, Tucson, AZ.), AD(Department of Mathematics, Australian National University, Canberra, Australia.), AE(Division of Science and Engineering, Murdoch University, Perth, WA, Australia.)
Publication:
The Astrophysical Journal, Volume 654, Issue 1, pp. 499-520. (ApJ Homepage)
Publication Date:
01/2007
Origin:
UCP
ApJ Keywords:
Magnetic Fields, Stars: White Dwarfs
DOI:
10.1086/509072
Bibliographic Code:
2007ApJ...654..499K

Abstract

We have conducted a survey of 61 southern white dwarfs searching for magnetic fields using Zeeman spectropolarimetry. Our objective is to obtain a magnetic field distribution for these objects and, in particular, to find white dwarfs with weak fields. We found one possible candidate (WD 0310-688) that may have a weak magnetic field of -6.1+/-2.2 kG. Next, we determine the fraction and distribution of magnetic white dwarfs in the solar neighborhood and investigate the probability of finding more of these objects based on the current incidence of magnetism in white dwarfs within 20 pc of the Sun. We have also analyzed the spectra of the white dwarfs to obtain effective temperatures and surface gravities.
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