Fig. 12
Blue (top) and red (bottom) AOV spectra of η Cen after pre-whitening for the 1.5562 c/d Štefl frequency; see also Fig. 2. Note the numerous features (“grass”) around 1.55 and 3.1 c/d, but also below both frequency regions. The complex close to 4.8 c/d corresponds to one-third of the satellites’ orbital frequency (fo/ 3). Compare this figure also to Fig. 2.
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