Abstract

The existence of polarization in rotationally broadened pure absorption lines is shown. The effect arises largely through the breaking of the axial symmetry about the line-of-sight by rotation so that the cancellation of polarized continuum radiation is incomplete. This symmetry breaking takes place as a result of the rotationally displaced local line profile covering part of the polarizing continuum on the apparent disc of the star. The result of this local shadowing of the disc by the line is a net polarization which varies across the rotationally broadened line

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