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The nature of the cometary knots in the Helix planetary nebula (NGC 7293) |
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| Authors: | Meaburn Clayton Bryce Walsh Holloway & Steffen |
| Institution: | Department of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL,;Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX,;Space Telescope Coordinating Facility, ESO, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany |
| Abstract: | |
| Keywords: | planetary nebulae: individual: NGC 7293 |