Fig. 1
Power spectrum of the radial velocities of the secondary star. Peaks around 0.7 and 2.7 day-1 are one-day aliases of the orbital period at 1.68325 day-1. The aliases are strong because the orbital period is long and only part of a cycle is observed nightly. In the inset box of the figure the CLEANed power spectrum peak is shown, marking the precise period of the system.
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