Fig. C.1.
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Dynamical spectra of MWC 656. Phases are shown for two orbital periods. White horizontal bars indicate the phases at which HERMES spectra are taken. Top, from left to right: He IIλ4686, He Iλ6678 + He IIλ6683, He Iλ5875. Bottom, from left to right: Hα, Hβ, Fe IIλ4583. For He Iλ5875, part of the spectra where v > 200 km s−1 is put equal to one because of telluric contamination and contamination from the interstellar Na I line. Top-middle (He Iλ6678 + He IIλ6683) and -right (He Iλ5875) panels trace similar motion in emission as He IIλ4686 on top of the absorption coming from the Be star.
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