Fig. 4
StokesV (red), null polarization N1 (blue) and N2 (green), and I (black) LSD profiles of Betelgeuse for the 30 dates selected as described in Sect. 3.2and spanning along the eight seasons between March 2010 and April 2017 (Table A.1). We note that the UT observation date is encoded for each retained night (see Table A.1). The vertical line corresponds to the HRV of Betelgeuse (about 21 km s−1).
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