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Fig. 9

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V-band magnitudes of HD 37806 from the literature (Hardie et al. 1964; Warren & Hesser 1977; de Winter et al. 2001, see Sect. 2.1; crosses), ESO (Manfroid et al. 1991, see Sect. 2.3; filled circles) and ASAS (Sect. 2.4; open circles) with sizes of symbols logarithmically scaled depending on the number of data points in a given season (compare with Figs. 1 and 2). While the literature plotted data correspond to typically 2–5 observations obtained within a few days, the ESO and ASAS observations correspond up to 80 observations per season. The large cross marks the mean Tycho-2 V magnitude with its uncertainty assigned here for the duration of the Hipparcos mission.

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