Some early-type stars exhibit very strong, globally-organized magnetic fields (right). Their magnetic geometries can be approximately described with a dipole inclined with respect to the stellar rotational axis. For such stars we can measure and interpret line profile variation in all four Stokes parameters. The Stokes V spectra provide information about the line of sight magnetic component while linear polarization spectra (Stokes Q and U) characterize the transverse magnetic field.
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