The global motions of the cometary knots in the Helix planetary nebula (NGC 7293).

Details The global motions of the cometary knots in the Helix planetary nebula (NGC 7293). The global motions of the cometary knots in the Helix planetary nebula (NGC 7293).

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.281l..57m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. Vol. 281, No. 3, p. L57 - L61

Astronomy and Astrophysics

Astronomy

15

Planetary Nebulae: Individual: Ngc 7293, Planetary Nebulae: Radial Velocities, Planetary Nebulae: Kinematics, Planetary Nebulae: Structure

Scientific paper

Systematic measurements of the radial velocities of a significant sample of the Helix cometary knots have been made in a sustained period of exceptionally good "seeing". This kinematical information has been combined with [O III] 5007-Å images of the whole of the Helix nebula to identify the location of each knot. A global expansion velocity of ≍10 km s-1 for the system of knots has been found, which is far less than the 24 km s-1 general expansion of the Helix nebula. A model is favoured in which the cometary knots are relics of condensations in the precursor, red giant/AGB, slow, dense wind now overrun by faster shells (and perhaps fast winds) generated after the formation of the planetary nebula.

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