Since the bubble is not seen in the I band image, this is a emission nebula. A bright, compact knot is inside the bubble, probably a jet knot. This showed more nebulosity closer to the stars, as well as another jet knot. The image shown is the F675W exposure, with a Tiny Tim PSF subtracted. Crosses mark the positions of the two stars.
North is to the upper right.
A paper by Krist et al.