It appears strongly in h-alpha on other images I've found, it appears to be a torus shape around that star. Probably unrelated, possibly a blob that becomes toroidal when imaged with the bright star in front of it, due to camera or processing effects.
You can see it here:
https://upload.wikimedia.org/wikipedia/commons/e/e3/Heart_Nebula.jpg
and here:
https://apod.nasa.gov/apod/image/1909/HeartNebula_Falls_2378.jpg
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Mike Bradshaw
1980 911SC sunroof coupe, silver/black
Putting the sick back into sycophant!
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