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Echelle Measurements of the Expansion Velocities of the Faint Giant Haloes of Planetary Nebulae

Published online by Cambridge University Press:  07 August 2017

M. Bryce ,
J. Meaburn  and
J.R. Walsh
M. Bryce
Affiliation:
1Department of Astronomy, University of Manchester Oxford Road, Manchester M13 9PL. UK
J. Meaburn
Affiliation:
1Department of Astronomy, University of Manchester Oxford Road, Manchester M13 9PL. UK
J.R. Walsh
Affiliation:
2Space Telescope European Coordinating Facility, ESO Karl-Schwarzchild-Strasse 2, D-8046, Garching bei München, Germany

Extract

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The faint, giant haloes observed in many Planetary Nebulae (PNe) are believed to be the remnants of the superwinds ejected by the progenitor asymptotic giant branch stars. Spatially resolved, high spectral resolution observations of [OIII]5007Å line profiles from the haloes of NGC 6543 and NGC 6826 have been obtained with the Manchester echelle spectrometer at the Isaac Newton Telescope. The widths of the observed profiles from NGC 6826 decrease towards the outer edge of the halo which implies a definite radial expansion of this halo. The expansion velocities vexp of the two haloes are derived using both thick and thin shell models.

Type
IV. Planetary Nebulae Connection: Evolution from the AGB
Information
Symposium - International Astronomical Union , Volume 155: Planetary Nebulae , 1993 , pp. 377
Copyright
Copyright © Kluwer 1993