Short-term variability and mass loss in Be stars - IV. Two groups of closely spaced, approximately equidistant frequencies in three decades of space photometry of ν Puppis (B7-8 IIIe)

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Fig. 4.

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Radial velocities of stellar Hδ-H8 lines (open black symbols), other stellar lines (He I 4026.2, He I 4143.8, He I 4471.5, and Mg II 4481.2; open blue symbols), and the circumstellar shell line in Hα (filled symbols). It can be seen that the accuracy of the ESPaDOnS measurements (crosses near mJD 57500) is highest, that of the HEROS measurements (triangles) lowest. Measurements with FEROS (CES) are plotted as squares (circles). See also Table 4 and Sect. 3.1.

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