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Fig. 4

image

Measurements of the EW of the emission components for our five target stars, plotted against Julian Date for AzV 220 and against rotational phase for the remaning targets (ephemerides from Nazé et al. 2015). For BI 57 we have considered both the case of a rotation period of 400 d and the case of a rotation period of 787 d. In all panels, triangles refer to He II λ4686, and circles to Hβ measurements. Red filled symbols refer to our new He II λ4686 and Hβ obtained with FORS2, FLAMES, and the B&C given in Table 2. Empty symbols refer to data obtained in previous works, as detailed in Sect. 3.2.

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