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you can see if its an optical reflection by moving the star within the frame and seeing if the halo moves with respect to where the star moves... if the star is in the left of the field, the halo will be offset from the star to the left. if its in the right of frame, the halo will offset to the left. when centralised the halo should be concentric to the star...
Longer exposures in my experience make matters worse, heavy stretching does it as well... It can be corrected by moving the reflection causing element further from the imaging plane, or if its from a filter, you could buy a higher quality anti-reflective filter..
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