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    • The creation of the helix planetary nebula (ngc 7293) by multiple events 

      Meaburn, J.; Boumis, P.; López, J. A.; Harman, D. J.; Bryce, M.; Redman, M. P.; Mavromatakis, F. (Oxford University Press (OUP), 2005-07-01)
      A deep continuum-subtracted image of NGC 7293 has been obtained in the light of the H alpha+[N II] emission lines. New images of two filamentary halo structures have been obtained, and a possible detection of a collimated ...