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• W2047542085 abstract "We present and interpret new spectropolarimetric observations of the magnetic white dwarf WD 1953–011. Circular polarization and intensity spectra of the Hα spectral line demonstrate the presence of two-component magnetic field in the photosphere of this star. The geometry consists of a weak, large-scale component, and a strong, localized component. Analyzing the rotationally modulated low-field component, we establish a rotation period -->Prot = 1.4480 ± 0.0001 days. Modeling the measured magnetic observables, we find that the low-field component can be described by the superposition of a dipole and quadrupole. According to the best-fit model, the inclination of the stellar rotation axis with respect to the line of sight is -->i ≈ 20°, and the angle between the rotation axis and the dipolar axis is -->β ≈ 10°. The dipole strength at the pole is about 180 kG, and the quadrupolar strength is about 230 kG. These data suggest a fossil origin of the low-field component. In contrast, the strong-field component exhibits a peculiar, localized structure (magnetic spot) that confirms the conclusions of Maxted and coworkers. The mean field modulus of the spot ( -->|Bspot| = 520 ± 7 kG) together with its variable longitudinal magnetic field having a maximum of about +400 kG make it difficult to describe it naturally as a high-order component of the star's global poloidal field. Instead, we suggest that the observed strong-field region has a geometry similar to a magnetic flux tube." @default.
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• W2047542085 date "2008-08-10" @default.
• W2047542085 modified "2023-10-12" @default.
• W2047542085 title "The Peculiar Magnetic Field Morphology of the White Dwarf WD 1953−011: Evidence for a Large‐Scale Magnetic Flux Tube?" @default.
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• W2047542085 doi "https://doi.org/10.1086/589234" @default.
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