Echelle measurements of the electron temperature of the giant halo of the planetary nebula NGC 6543

Details Echelle measurements of the electron temperature of the giant halo of the planetary nebula NGC 6543 Echelle measurements of the electron temperature of the giant halo of the planetary nebula NGC 6543

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.252..535m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 252, Oct. 15, 1991, p. 535-542.

Astronomy and Astrophysics

Astronomy

33

Echelle Gratings, Electron Energy, Halos, Planetary Nebulae, Stellar Evolution, Brightness Distribution, H Alpha Line, Stellar Mass Ejection, Stellar Spectra, Stellar Winds

Scientific paper

Observations with the Manchester echelle spectrometer, of spatially resolved profiles of the H-alpha, forbidden N II, and forbidden O III lines from a bright knot in the halo of NGC 6543 yield and electron temperature of Te = 8860 +/- 1000 K. This seemingly contradicts a previous measurement of Te = 14,700 +/- 850 K from the forbidden O III (5007 A/4363 A) line intensity ratio for exactly the same area of the halo which is 6000 K higher than that given for the nebular core by the same line ratio method. A model in which flows of 'mass-loaded' stellar wind form bow shocks around halo clumps is presented in an attempt to explain this apparent discrepancy in the values of Te for the halo of NGC 6543 that is found between the profile and ratio methods. The model is also substantiated by observations of the relative positions of the small-scale features of the H-alpha, forbidden N II and forbidden O III emission regions.

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