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-iart

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_query?1973A%26A....29..277V&defaultprint=YES&filetype=.pdf http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_quer... http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1975A%26A....41..355L&defaultprint=YES&filetype=.pdf http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_quer...