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Fig. 4


Continuum-corrected and slightly spatially filtered Hα image of the bow shock around λ Cephei. North is up, east is left, the size of the plotted field is 22′ × 22′. The imaging data were taken as part of the IPHAS (Drew et al. 2005) survey. A bright and well-defined bow shock nebula is visible toward the SE of the star. The roughly spherical Hα structure centered on λ Cephei is an out-of-focus ghost of the bright star, the dark inner rings are the equivalent structure from the r-filter image used for continuum subtraction. In addition to these purely instrumental effects, several Hα bright features are visible close to the star. A more detailed discussion of the multi-wavelength properties of the bow shock and the circumstellar environment of this runaway O6 star will be presented in an upcoming paper.

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