Color composite of the Ophiuchus, Pipe Nebula, and Lupus cloud complexes (blue: extrapolated Planck 250 μm, green: Planck 350 μm, red: Planck 500 μm). The star symbols represent the position of massive ionizing stars (B3 or earlier), while symbol size represents relative brightness. Most of these stars have associated Hα extended emission, while only the two fainter objects are not associated with WISE extended emission. Most, if not all stars in this figure are interacting with the molecular cloud complex and constitute the main source of dust heating (the bluer regions) in the complex.