Spectropolarimetric Observations of the Unique White Dwarf GD 356 on the 6-m BTA |
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| Authors: | Yu. N. Gnedin N. V. Borisov T. M. Natsvlishvili M. Yu. Piotrovich |
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| Affiliation: | (1) Main Astronomical Observatory, Russian Academy of Sciences, Russia;(2) Special Astrophysical Observatory, Russian Academy of Sciences, Russia;(3) St. Petersburg State Technical University, Russia |
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| Abstract: | The results of spectropolarimetric observations of a unique magnetic white dwarf with emission lines, GD 356, on the 6-m BTA are presented. The star's magnetic field is estimated and it is shown not to rotate over times of  5 yr. Allowance for magnetic deformation of the star's surface, resulting an a nonuniform temperature distribution over its surface, showed that in the region of the magnetic poles the conditions may be satisfied for a  radiative diskon in the form of a plasma jet, originating from the action of cyclotron radiation pressure. It is shown that the effect of nonuniformity of the surface temperature distribution of the white dwarf can produce the observed broad-band and resonance polarization of the stellar emission. |
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