2011A&A...527A.120L

We propose and explore a new diagnostic technique based upon the linear polarization emitted in Hanle-sensitive lines in disk-integrated stars where a dipolar magnetic field breaks the rotational symmetry of the resonance scattering polarization A star with a simple dipolar field and a 1-0 spectral line were used to compute polarization amplitudes and angles. Predicted amplitudes are low but within reach of present instrumentsA new application of the Hanle effect is proposed and analyzed as a tool that allows measuring of some of the weakest stellar magnetic fields.