This reminds me of the 'stellar rings' of Isserstedt and Schmidt-Kaler from the late 1960s and early 1970s: http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_quer...…
This reminds me of the 'stellar rings' of Isserstedt and Schmidt-Kaler from the late 1960s and early 1970s: http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_quer...…