Abstract
The nature and origin of the hundreds of ionized knots, with cometary tails, in the Helix planetary nebula are both being unravelled by recent observations. Healey and Huggins (1990, AJ, 100, 511), Meaburn et al (1992, MNRAS, 255, 177) and Walsh and Meaburn (1993, ESO Messenger, 73, 35) all showed, in various ways, that these knots have dense (106 cm-3), dusty, molecular cores with ionized arcs of gas on the surfaces pointing towards the ionizing star. This structure is confirmed in detail by the HST imagery of O’Dell and Handron (1996, ApJ, in press).
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© 1997 Springer Science+Business Media Dordrecht
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Meaburn, J., Clayton, C.A., Bryce, M., Walsh, J.R. (1997). The Global Motions of the Cometary Knots in the Helix Planetary Nebula (NGC 7293). In: Habing, H.J., Lamers, H.J.G.L.M. (eds) Planetary Nebulae. International Astronimical Union / Union Astronomique Internationale, vol 180. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5244-0_114
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DOI: https://doi.org/10.1007/978-94-011-5244-0_114
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