The new magnetic white dwarf PG 1031 + 234 - Polarization and field structure at more than 500 milion Gauss

Details The new magnetic white dwarf PG 1031 + 234 - Polarization and field structure at more than 500 milion Gauss The new magnetic white dwarf PG 1031 + 234 - Polarization and field structure at more than 500 milion Gauss

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...309..218s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 309, Oct. 1, 1986, p. 218-229.

Physics

79

Magnetic Stars, Polarimetry, Stellar Magnetic Fields, Stellar Radiation, Stellar Spectrophotometry, White Dwarf Stars, Absorption Spectra, H Lines, Space Plasmas, Spectral Energy Distribution, Stellar Rotation, Zeeman Effect

Scientific paper

PG 1031+234 is a newly discovered rotating, magnetic white dwarf. Its optical light is highly polarized, Pmax ≈ 6%, Vmax ≈ -12%, and strongly modulated on the 3 hr 24 minute rotation period. Optical and UV spectrophotometry reveal a spectrum of diffuse absorption features which match Zeeman calculations of hydrogen in fields 200 - 500×106G. The authors discuss the origin of polarized emission from a cold magnetized plasma and derive the polarization characteristics of the propagation eigenmodes. The results are used to model the polarization behavior of PG 1031+234 using crude approximations to the radiation physics and a straightforward geometric analysis. The observations can be reproduced by a rotating star containing an oblique centered dipole which is punctuated near its magnetic equator by a strong magnetic spot.

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