The 1365-day radial-velocity period of HD 216946 is probably caused by chromospheric activity and extended-atmosphere dynamics, not by a Keplerian companion.
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Origin of the Long-Period Radial Velocity Variation in the Red Supergiant HD 216946 (V424 Lac)
The 1365-day radial-velocity period of HD 216946 is probably caused by chromospheric activity and extended-atmosphere dynamics, not by a Keplerian companion.