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The rotationally modulated Zeeman spectrum at nearly 10 to the 9th Gauss of the white dwarf PG 1031 + 234
Latter, William B.; Schmidt, Gary D.; Green, Richard F.
AA(Steward Observatory, Tucson, AZ), AB(Steward Observatory, Tucson, AZ), AC(Kitt Peak National Observatory, Tucson, AZ)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 320, Sept. 1, 1987, p. 308-314. (ApJ Homepage)
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NASA/STI Keywords:
Light (Visible Radiation), Stellar Atmospheres, Stellar Magnetic Fields, Stellar Rotation, White Dwarf Stars, Zeeman Effect, Circular Polarization, Computational Astrophysics, Magnetic Field Configurations, Morphology, Optical Polarization, Signal To Noise Ratios
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Detailed analyses are performed of high-quality, phase-resolved CCD spectroscopy of the absorption-line spectrum throughout its rotation period of the new white dwarf PG 1031 + 234. The spectral variations are discussed and compared with new theoretical calculations of the behavior of hydrogen in strong magnetic fields. This analysis is then extended through a modeling procedure which produces a synthetic magnetically distorted spectrum for a star of arbitrary field strength and structure. The results confirm that PG 1031 + 234 possesses the strongest field yet detected on a white dwarf, with regions on the surface spanning the range of about 200 to nearly 1000 MG. The spectroscopic data reflect a field pattern containing a slightly offset global component of polar field strength of about 500 MG together with a localized magnetic 'spot' whose central field approaches 2000 MG.

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