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Fig. A.1


Multiband images of the Pistol Star. Top row: a) 28″ × 25″ 2MASS K-band image, the red crosses correspond to 2MASS known objects; b) 1.12′ × 1.12′Spitzer IRAC4 image treated to enhance the surrounding nebula of the Pistol Star; c) WISE 2′ × 2′ “tricolour” image R = WISE2, G = WISE2, B = WISE1, the channels 4 and 3 are saturated and cannot be used. This image shows the large nebula surrounding Pistol Star. Bottom row: d) NACO 28″ × 25″ K image, the red circles correspond to 2MASS stars; several known stars are identified in the image. It illustrates the adaptive optics capability in the field; e) zoom (7″ × 5″) of image d) where the surrounding stars are numbered. The white circle has a 5.5 diameter. The objects labelled “u” are possible artefacts. For all images, the orientation is north-top, east-left.

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