The CARMENES search for exoplanets around M dwarfs - Variability on long timescales as seen in chromospheric indicators

Open Access

Fig. 2

Time series of J23245+578/BD+57 2735. We show the pEW(Hα) (top, black dots), pEW(Ca II IRT₁ ) (middle, blue dots), and I_TiO (bottom, magenta dots). Additionally, the best linear fit is indicated as the solid line. The error bars are not statistical, but determined by the activity jitter of inactive stars.

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