Fig. 10
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Generalized Lomb-Scargle periodograms for RVs, photometric variations, bisector variations, and stellar activities of HD 18884. (a) GLS periodogram for RVs, (b) the same GLS periodogram for the residual RVs after subtracting the strong peak of 885 days, (c) GLS periodogram of our time sampling (window function), (d) GLS periodogram of the HIPPARCOS photometric data, (e) GLS periodograms of the BVS and the BVC, (f) H EW variations, and (g) sodium line EW variations. The vertical dashed lines indicate orbital periods of 885 days. The horizontal lines in each panel correspond to a 1% FAP.
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