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

M. Bryce,J. Meaburn,J. R. Walsh

doi:10.1007/978-94-011-2088-3_176

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

M. Bryce, J. Meaburn + Show 1 more

https://doi.org/10.1007/978-94-011-2088-3_176

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Publication Date: Jan 1, 1993

Affiliation: University of Manchester, Space Telescope European Coordinating Facility

#Manchester Echelle Spectrometer #Thin Shell Models + Show 8 more

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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]5007A 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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