(IAAC) Isserstedt stellar rings

Hi all,
I am actually reviewing an article written by a fellow amateur for Ciel
Extreme dedicated to these stellar groups: rings of stars having formed
around a massive star embedded in nebulosity through the intesraction
between its stellar wind and the nebula.
If someone knows where I could find the list of these potential rings, I
would be happy to have it.
Any info and/or comments about the reality of such groupings are also welcome.
Thanks in advance,
Carpe noctem, Yann.
Yann Pothier
11 impasse Canart, 75012 PARIS, FRANCE
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