Fig. 2
IQUV LSD profiles of Betelgeuse for 27 November 2013 and April 8, 2014. Top panel: Stokes I. Middle panel: Stokes Q (blue), U (red), and V (green) signals, where the V signal has been magnified by a factor ten. Bottom panel: null polarization signal N1 , with the same color code as for the Stokes parameters. Small vertical lines represent typical error bars with the same color code. The vertical line corresponds to the HRV of Betelgeuse (about 21 km s−1).
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