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Fig. 14


Number of magnetic massive stars as a function of the logarithm of the dipolar magnetic field strength Bd. The histogram was drawn using a fixed bin size of Δlog (Bd) = 0.2 dex. The histogram drawn with a dashed line was obtained considering only those stars for which a definite value of Bd is available (i.e., excluding the stars for which only a lower limit on Bd is available). The arrows show the position of the four stars with the weakest magnetic field (for ϵ CMa the Bd value is a lower limit). The vertical dotted line indicates the magnetic field detection threshold of the FORS low-resolution spectropolarimeters (see text for more details).

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