The pi line polarization in magnetic white dwarfs

Details The pi line polarization in magnetic white dwarfs The pi line polarization in magnetic white dwarfs

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.272...24a&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 272, Issue 1, pp. 24-40.

Astronomy and Astrophysics

Astronomy

3

Line, Formation-Polarization-Radiative Transfer-Stars, Magnetic Fields-White Dwarfs.

Scientific paper

The pi subcomponents of hydrogen line transitions only absorb light that is linearly polarized parallel to a local magnetic field. In the spectra of magnetic white dwarfs, the circular polarization in these pi lines is usually expected and often observed to be reduced in magnitude relative to the neighbouring continuum. However, observations of some strongly magnetized white dwarfs show some pi lines that have circular polarization equal to that of the adjacent continuum. We show that this is a consequence of the effect of magnetic anomalous dispersion (magneto-optical effects) on radiative transfer. The observed equality between continuum and pi line polarization is obtained, in theory, at adequately high fields and for special field geometries.

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