Fig. 1

Sketch of the model described in Sect. 2. Star generations #1, #2, and #3 are respectively in red, blue, and green. In panel b), SNe remnants are shown with a dark contour. The reddish background symbolizes 60Fe delivered by the SNe belonging to the first star generation. In panel c), the purple color of the shell symbolizes the combination of 26Al delivered by the single massive star wind from generation #2 and the 60Fe delivered by generation #1 stars. Our Sun, born in the circumstellar shell together with a few hundreds fellow low-mass stars (generation #3), is shown in yellow.
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