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The science of measuring the polarization of light from celestial objects at narrower bandwidths than is possible with a conventional polarimeter. The principles are the same as with a conventional polarimeter, but the wavelengths measured are isolated with a spectrograph rather than with filters. Spectropolarimetry is used to measure the magnetic fields of stars from the Zeeman effect and to study the origin of spectral lines.

Subjects: Astronomy and Astrophysics.

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