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Aims. Previous studies have shown that, for late-type stars, activity indicators derived from the Ca ii infrared-triplet (IRT) lines are correlated with the indicators derived from the Ca ii HK we find good agreement for stars with already existing literature values. In a few cases the computed periodograms show a complicated structure with multiple peaks, meaning that formally different periods are derived in different indices. We show that in one case, this is due to data sampling effects and argue that denser cadence sampling is necessary to provide credible evidence for differential rotation. However, our TIGRE data for HD 101501 shows good evidence for the presence of differential rotation.

Stellar rotation periods determined from simultaneously measured Ca II H&K and Ca II IRT lines