CO globules in the shell that encloses the Veil bubble. Left panel: Spitzer’s 8 μm image (2″ resolution). Numbers mark the position of the CO globules (shown in the middle and right panels). Stars show the position of YSOs detected in the field (Megeath et al. 2012, 2016). Globule #1 matches the position of YSO #1728 (red star). Middle panel: [C II] 158 μm emission at v_LSR = −7 to 0 km s⁻¹ (backgroundgrey image) and ¹²CO globules #1, #2 and #3 in the same velocity range (emission in red contours). Right panel: same as the middle panel but for the range v_LSR = 0 to +4 km s⁻¹. The arcs approximately represent the projection of concentric expanding rings in the shell (blue for rings closer to us).