Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255..460d&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, April 1, 1992, p. 460-462.
Astronomy and Astrophysics
Astronomy
10
Halos, Mass Flow, Planetary Nebulae, Stellar Winds, Electron Energy, Ionized Gases
Scientific paper
Three PNe have extended haloes which have measured T(e)s considerably in excess of those measured for the corresponding cores. It is suggested that this is caused by the shocking of a mildly supersonic flow exiting from the core against clumps of material in the halo regions. This flow is produced as a fast stellar wind mass-loads as it percolates through core regions containing clumps of previously ejected material. This model predicts temperature fluctuations of 5000-10,000 K in the halo regions and that the regions of enhanced temperature will be dynamically inert. Recent measurements of the linewidths in the halo of NGC 67543 are in agreement with this model. This type of flow may also be responsible for the accelerated haloes which have been observed in several PNe.
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