Bibcode
Valyavin, G.; Wade, G. A.; Bagnulo, S.; Antonyuk, K.; Plachinda, S.; Clark, D. M.; Fox Machado, L.; Alvarez, M.; Lopez, J. M.; Hiriart, D.; Han, I.; Jeon, Y.-B., Zharikov, S. V.; Zurita, C.; Mujica, R.; Shulyak, D.; Burlakova, T.
Bibliographical reference
Magnetic Stars. Proceedings of the International Conference, held in the Special Astrophysical Observatory of the Russian AS, August 27- September 1, 2010, Eds: I. I. Romanyuk and D. O. Kudryavtsev, p. 295-302
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2011
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0
Refereed citations
0
Description
The magnetic white dwarf WD 1953-011 demonstrates the presence of
two-component magnetic field geometry in photosphere. The geometry
consists of a weak, large-scale component, and a strong, localized
component (magnetic ``spot''). The localized component of the field is
derived from variable due to the star's rotation circular polarization
and intensity spectra. The flux from WD 1953-011 is also variable with
rotation in the V-band filter. This variability can be explained by the
presence of a dark spot having a magnetic nature, analogous to sunspots.
Motivated by this idea, and using all available observations of WD
1953-011 we examine the possible physical relationships between the
suggested dark spot and the strong-field magnetic structure recently
identified on the surface of this star. Comparing the
rotationally-modulated flux with the variable spectral observables
related to the magnetic ``spot'' we establish their physical
relationship. We discuss this result in the frame of the first
observational evidences for the presence of active magnetic structures
in magnetic white dwarfs.