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The pecular magnetic field morphology of the white dwarf WD 1953-011: evidence for a large-scale magnetic flux tube? | G. Valyavin
; G.A.Wade
; S. Bagnulo
; T.Szeifert
; J.D.Landstreet
; Inwoo Han
; A.Burenkov
; | Date: |
19 Apr 2008 | Abstract: | We present and interpret new spectropolarimetric observations of the magnetic
white dwarf WD 1953-011. Circular polarization and intensity spectra of the
H$alpha$ 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 $P_{rot} = 1.4480
pm 0.0001$ 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 $i approx 20^circ$, and
the angle between the rotation axis and the dipolar axis is $eta approx
10^circ$. 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 co-workers. The mean field modulus of the spot ($|B_{spot}| = 520 pm 7$
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. | Source: | arXiv, 0804.3140 | Services: | Forum | Review | PDF | Favorites |
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