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Fig. 2


Period analysis for the object with multiple spots CSIMon-000198: original light curve after removal of spurious points in the upper panel, periodogram in the middle left panel, auto-correlation function in the middle right panel, string-length method in the lower left panel, phased light curve with the final period in the lower right panel. Red, green and blue dotted curves superimposed over the periodogram in the middle left panel correspond respectively to the mean, mean+3σ and mean+10σ periodogram expected in case the mag fluctuations about the mean were due to random noise. Different colors in the lower right panel correspond to different rotational cycles. Due to the nearly symmetric shape of the main periodic feature around a less deep minimum at about the half-period, this last is erroneously detected as the highest power (best rotational period) when using the periodogram analysis; on the other hand, the correct periodicity is indicated by both the other methods.

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