Abstract
The results of spectropolarimetric observations of a number of magnetic white dwarfs obtained on the 6-m optical telescope of the Special Astrophysical Observatory are presented. The observations were carried out using the SCORPIO focal aperture-ratio reducer in a spectropolarimetric regime. Two characteristic dependences of the degree of polarization on the wavelength are observed. For one group of objects, the degree of linear polarization grows with wavelength, suggesting that the alignment of atoms and molecules in Rydberg states in the atmosphere of the white dwarf due to the action of its magnetic field influences scattering processes. The second group of objects displays an increase in the degrees of both linear and circular polarization with wavelength, providing evidence for the presence of protoplanetary disks around these magnetic white dwarfs, in which the alignment of circumstellar grains leads to the observed behavior.
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References
A. Z. Dolginov, Yu. N. Gnedin, and N. A. Silant’ev, Propagation and Polarization of Radiation in Cosmic Media (Gordon Breach, Bazel, Switzerland, 1995).
Yu. N. Gnedin, N. V. Borisov, V. M. Larionov, T. M. Natsvlishvili, M. Yu. Piotrovich, and A. A. Arkharov, Astron. Rep. 50, 553 (2006).
H. A. Bethe and E. E. Salpeter, Quantum Mechanic of One- and Two-Electron Atoms (Academic, New York, 1957).
Yu. N. Gnedin, A. A. Mihajlov, Lj. M. Ignjatovic, N. M. Sakan, V. A. Sreckovic, M. Yu. Zakharov, N. N. Bezuglov, and A. N. Klycharev, New Astron. Rev. 53, 259 (2009).
Yu. N. Gnedin, M. Yu. Piotrovich, and A. N. Klyucharev, in Physics and Evolution of Magnetic and Related Stars, Ed. by Yu. Yu. Balega, I. I. Romanyuk, and D. O. Kudryavtsev, ASP Conf. Ser. 494, 261 (2015).
H. L. Welsh, in Physical Chemistry, Ser. 1: Spectroscopy, MTP International Review of Science (Univ. Park Press, Butterworths, London, Baltimore, 1972), Vol. 3, p. 33.
A. Borysow, U. G. Jorgensen, and C. Zheng, Astron. Astrophys. 324, 185 (1997).
R. D. Rohrmann, A. M. Serenelli, L. G. Althaus, and O. G. Benvenuto, Mon. Not. R. Astron. Soc. 335, 499 (2002).
A. A. Mihajlov, M. S. Dimitrijevic, and Z. Djuric, Phys. Scr. 53, 159 (1996).
A. A. Mihajlov, Z. Djuric, M. S. Dimitrijevic, and N. N. Ljepojevic, Phys. Scr. 56, 631 (1997).
A. A. Mihajlov, D. Jevremovic, P. Hauschildt, M. S. Dimitrijevic, Lj. M. Ignjatovic, and F. Alard, Astron. Astrophys. 403, 787 (2003).
V. L. Afanasiev and A. V. Moiseev, Astron. Lett. 31, 194 (2005).
A. Kawka, S. Vennes, G. D. Schmidt, D. T. Wickramasinghe, and R. Koch, Astrophys. J. 654, 499 (2007).
C. Koen and P. F. L. Maxted, Mon. Not. R. Astron. Soc. 371, 1675 (2006).
B. Zuckerman and E. E. Becklin, Nature 330, 138 (1987).
J. H. Debes, D. W. Hoard, S. Wachter, D. T. Leisawitz, and M. Cohen, Astrophys. J. Suppl. 197, 38 (2011).
Z. Wang, A. Tziamtzis, and X. Wang, Astrophys. J. 782, 20 (2014).
M. Zejmo, A. Slowikowska, K. Krzeszowski, P. Reig, and D. Blinov, Mon. Not. R. Astron. Soc. 464, 1294 (2017).
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Original Russian Text © V.L. Afanas’ev, M.Yu. Piotrovich, Yu.N. Gnedin, S.D. Buliga, T.M. Natsvlishvili, 2018, published in Astronomicheskii Zhurnal, 2018, Vol. 95, No. 2, pp. 152–157.
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Afanas’ev, V.L., Piotrovich, M.Y., Gnedin, Y.N. et al. Spectropolarimetric Observations of Magnetic White Dwarfs with the SAO 6-m Telescope. Astron. Rep. 62, 138–143 (2018). https://doi.org/10.1134/S1063772918020014
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DOI: https://doi.org/10.1134/S1063772918020014