Fig. 4.

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Long-term photometry and time-frequency analysis of V815 Her. Top: DASCH light curve of ≈100 yr for V815 Her from scanned photographic plates (black dots) supplemented with photoelectric data (blue dots) spanning more than a century between 1890–1998 with 5 yr’ overlap. The spline smoothed data are indicated by a red line. Bottom: time-frequency analysis for the available photographic+photoelectric data of V815 Her using the TiFrAn code (Kolláth & Oláh 2009). The plot indicates dominant cycles of different lengths and amplitudes on timescales corresponding to ∼6.5, ∼9.1, ∼11.5, ∼13 and ∼26 yr, the latter two are probably multiples of the 6.5-yr period. Dashed lines indicate the 2092 d period of the wide orbit and its double at 4184 d (≈11.5 yr). See the text for more.
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