The left panel shows a B − V,V colour–magnitude diagram from the MCPS (Zaritsky et al. 2004). Stellar evolutionary tracks from Lejeune & Schaerer (2001) are shown as dashed red lines (bottom to top: 5, 15, 25 and 60 M_⊙) and solid red lines (bottom to top: 3, 9, 20 and 40 M_⊙). Heavy dashed blue lines denote the selection criteria for B-star candidates, which lie in the top left corner of the diagram. The right panel shows the MCELS-2 Hα image of the area around SNR J0530–7007. B-star candidates are denoted by overlaid red crosses.