The highly magnetic (B about 500 MG) white dwarf PG 1031+234 - Discovery of wavelength dependent polarization and intensity variations

Details The highly magnetic (B about 500 MG) white dwarf PG 1031+234 - Discovery of wavelength dependent polarization and intensity variations The highly magnetic (B about 500 MG) white dwarf PG 1031+234 - Discovery of wavelength dependent polarization and intensity variations

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...259..143p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 259, no. 1, p. 143-148.

Astronomy and Astrophysics

Astrophysics

3

Astronomical Polarimetry, Magnetic Variations, Stellar Magnetic Fields, White Dwarf Stars, Circular Polarization, Cosmic Plasma, Ubv Spectra

Scientific paper

Simultaneous five color (UBVRI) linear and circular polarimetry of PG 1031+234 have revealed a strong rotationally modulated circular polarization, peaking in the ultraviolet and decreasing toward the red. The optical light curves show intensity variations which are strongly correlated with the circular polarization changes. The photometric maximum occurs at nearly zero circular polarization and the intensity drops with the increasing degree of circular polarization by as much as 0.4 mag in the ultraviolet. The observed brightness is lowest when the highly magnetic spot is pointing to us. We suggest that both the polarization and the intensity variations arise from dichroism in the highly magnetic atmosphere, where the values of opacity are greatly different for the two senses of circular polarization. The decrease of circular polarization toward longer wavelengths is qualitatively explained by the fact that the fraction of solid angle in which circularly polarized light dominates decreases with increasing beta, where beta is the ratio of the electron cyclotron frequency to the observed angular frequency.

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