Open Access

Fig. 1


The top two plots show our new  ⟨ B ⟩  data phased with our best fit period, superimposed on the polynomial fits of Manfroid & Mathys (2000) to their larger  ⟨ B ⟩  dataset (green dashed curve). In the top panel the second, slightly different,  ⟨ B ⟩  curve (red dash-dotted line) is the variation of  ⟨ B ⟩  predicted by our adopted field geometry. The top panel data shows our individual measurements of  ⟨ B ⟩  using Fe ii λ6149 (data with error bars are ours, dots are from Manfroid & Mathys 2000); the second panel shows our measurements of  ⟨ B ⟩  using Nd iii λ5050 (filled symbols) and λ6145 (open symbols). The bottom figure depicts the  ⟨ Bz ⟩  field variations observed in HD 318107. The data points in green (open squares) are the measurements shown by Landstreet & Mathys (2000), shifted in phase to the present system; the red points (filled squares) are the new data from Table 1 plus (at phase 0.91) the metal line  ⟨ Bz ⟩  value reported by Bagnulo et al. (2006). The dash-dotted line denotes the  ⟨ Bz ⟩  rotational variation predicted by our adopted field geometry and phase system.

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