Nearly in the centre of Vel OB2 is its brightest member. Vel is a massive Wolf-Rayet star vigorously sloughing off its outer layers as a violent stellar wind. Pup, at the edge of the group to the right. A great many of the naked-eye stars within the plotted boundary are also members. Most of the nebular light comes from the inner surface of the expanding bubble , and is seen superimposed with the dark cloud itself.
Some wisps are beyond the cloud boundary.
Named after its discoverer, the Gum nebula can t be seen visually, but is one of the more magnificent structures of the photographic sky. Tr 10 OB association, named after its core cluster, Trumpler 10 . The proper motions of the association s members are much like those in Vel 2, but current evidence points to it being somewhat older. The fact that the Tr 10 group straddles the galactic equator may point to it as being a non-Gould belt feature, although it s still pretty close to the belt. As mentioned earlier, it s of an earlier generation, its age having allowed many members to escape into the general field.