Fig. 9.
Time series analysis of circumstellar emission lines. Left: bidimensional periodograms. The color range corresponds to the power of the periodogram, and the horizontal line represents the star’s rotation period, P = 6.53 days. The white contour represents the FAP level of about 95% confidence. Middle: line profiles obtained with the ESPaDOnS and HARPS spectrographs. The colors correspond to different rotation cycles. The two blue vertical lines delimit the periodic region of the Na I line. Right: correlation matrices. The color range corresponds to the value of the linear correlation coefficient. Perfect anticorrelation corresponds to −1 (black), no correlation to 0 (light blue), and a perfect correlation to 1 (orange).
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