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Fig. 1.

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Analysis of 4U 0115+53 performed on TESS (left) and at the SKO (right). Top panels: light curves where intra-night variability is clearly detected. Middle panels: periodograms. The dashed lines represent four times the average noise level of the final pre-whitening periodogram. The frequencies on both sides of f1 on the right panel are aliases at f1 ± 1 c d−1 and disappear after pre-whitening with f1. Bottom panels: phase diagrams folded with the 3.3 c d−1 frequency.

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