Fig. 6
Left: map of the Hα circumstellar emission of Betelgeuse. The color scale is linear in W m-2 μm-1 sr-1. The contours are from 1 to 105 W m-2 μm-1 sr-1 in absolute value, with a factor 10 spacing. The dashed red circle shows the infrared photosphere, and the dashed blue circle 3× its radius. The ellipse in the bottom left is the ZIMPOL beam. Right: color composite of the V, CntHα and TiO717 images.
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