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The global motions of the cometary knots in the Helix Planetary Nebula (NGC 7293)

Published online by Cambridge University Press:  25 May 2016

J. Meaburn ,
C. A. Clayton ,
M. Bryce  and
J. R. Walsh
J. Meaburn
Affiliation:
1Department of Physics & Astronomy, University of Manchester
C. A. Clayton
Affiliation:
2Rutherford Appleton Laboratory
M. Bryce
Affiliation:
1Department of Physics & Astronomy, University of Manchester
J. R. Walsh
Affiliation:
3ESTCF, ESO, Garching bei München

Extract

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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).

Type
IV. Envelopes
Information
Symposium - International Astronomical Union , Volume 180: Planetary Nebulae , 1997 , pp. 260
Copyright
Copyright © Kluwer 1997