Fig. 1
A schematic sketch of a star with a global dipole magnetic field, illustrating the formation regions of different features in the spectrum of HD 54879. Region I: blue-shifted UV resonance line absorption (e.g., C iv, Si iv); Region II: UV resonance line emission; Region III: shocked, X-ray emitting region; Region IV: recombination line emission at the magnetic equator (Hα, Hβ).
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