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Fig. 8

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Selected spectra of Teegarden’s star around the Hα line to demonstrate the line shape during quiescent phases and all flares. The spectra of activity level (1) are shown in green, of activity level (2) in blue, and of activity level (3) in red. The flare spectra are shown in magenta. There are a few spectra showing peculiar line shapes with broad additional line components either in absorption or emission (cyan lines). The dashed vertical line marks the central wavelength of Hα. The normalisation wavelength intervals are located well outside any broad wings at 6537.4–6547.9 and 6577.9–6586.4 Å. For the shown spectra the statistical errors are insignificant.

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