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Fig. 1


Total polarization emitted from a star in a Hanle-sensitive line for a dipolar field, aligned with the axis of rotation and included in the plane of the sky. Field strength of the dipole at the stellar surface is given in terms of the critical Hanle field of the observed line. The vertical axis is scaled in terms of the polarization Q0 emitted by the atom at 90-degree scattering in the absence of magnetic fields. The three inset images show the Q and U polarizations (Q defined positive tangent to the local meridian) in the disk-resolved star for a dipole field strength of 0, 40, and 80% of the critical Hanle field of the spectral line.

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