Abstract
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 v exp of the two haloes are derived using both thick and thin shell models.
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© 1993 Springer Science+Business Media Dordrecht
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Bryce, M., Meaburn, J., Walsh, J.R. (1993). Echelle Measurements of the Expansion Velocities of the Faint Giant Haloes of Planetary Nebulae. In: Weinberger, R., Acker, A. (eds) Planetary Nebulae. International Astronomical Union / Union Astronomique Internationale, vol 155. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2088-3_176
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DOI: https://doi.org/10.1007/978-94-011-2088-3_176
Publisher Name: Springer, Dordrecht
Print ISBN: 978-0-7923-2440-9
Online ISBN: 978-94-011-2088-3
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