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Fig. 7.

image

Amplitude of binary period variation calculated for a surface magnetic field of 1 kG, cycle length of Pact = 2 Pmod, magnetic field fluctuation amplitude of AB = 0.1, velocity field fluctuations of AV = 0.1, and varying active component mass. The noticeable decrease in period modulation at 0.37 M coincides with the transition from fully convective to radiative-core stars.

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