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It varies a bit depending on the image but basically curves and blending the image with a bit of extra curves in with the original so it doesn't washout the colours using a mask.
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The point here is you can't bring out those faint details with photoshop trickery only enhance what your scope captured in the first place.
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Well that's not entirely true, Here's the delema, at some stage you must decide where is the boundary that you lasso? Is it an arbitrary line you make up yourself? Then if you use curves/levels you have brightend the area as defined by you and not what may in fact be the the reality, you then blend it again by imparting a similar arbitary judgement and feather? It is not as important in say a nebula but trying to show a very faint circular halo you must be very careful or you risk only creating an imaginary halo..? When I check your halo shape with that produced by a very deep amplified plate by David Malin with the UK Schmidt your halo doesn't seem to be the same shape..?
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Also I started using sum combine in the combination method of combining the subs as it gives finer control and brought out the fainter stuff just that bit better thna median. The price is more artifacts like cosmic rays etc you have to clean up with the healing tool later but its not that bad.
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I have always only used sum or add for exactly this reason.
Mike