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Fig. 2.


Light curves of HR 1099 in the X-ray and optical regime. Top panel: X-ray flux of HR 1099 in the energy range 2–10 keV as a function of time. For clarity, we omitted the error bars in this plot, but the values can be found in Table 1. Bottom panel: change in optical flux (V-band) as a function of time. Blue data are taken from Berdyugina & Henry (2007), green data from Muneer et al. (2010) and red data from Jetsu et al. (2017). The black dots represent an annual binning of the data.

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