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Fig. 5.

image

2010 RVs of α Cen B as measured on three different spectral lines with wavelength 5602.91 Å (top panel), 4337.05 Å (middle panel) and 4173.93 Å (bottom panel). The median RV error on these spectral lines is 8.7, 8.9 and 10.0 m s−1, respectively. Each panel is divided in two, on the left we show the RV of the line as a function of time, and on the right, the correlation of the RV of this line with the RV derived using all the spectral lines. In 2010, α Cen B is activity and the signal seen in the RV of all the lines is mainly due to activity. Therefore, a strong correlation between the RV of a spectral line with those RVs implies that the line is strongly affect by activity signals.

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