The Hanle and Zeeman Effects in the Ba ii D2 line

摘要

We present a theoretical investigation on the influence of the m agnetic field on the linear and circular polarization of the Ba II D2 line at 4554 A, through the Hanle and Zeeman effects. We show in particular the existence of a differential magnetic sensitivity of the three-peak structure of the Q/I profile observed for this line, which is of interest for magnetic field diagnostics.