Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pasp...94...43d&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 94, Feb. 1982, p. 43-49. NSF-supported research.
Astronomy and Astrophysics
Astronomy
7
Astronomical Spectroscopy, Emission Spectra, Line Spectra, Luminous Intensity, Planetary Nebulae, Red Shift, Cosmic Dust, Doppler Effect, Expansion, High Dispersion Spectrographs, Ionization Potentials, Mass Distribution, Radial Distribution
Scientific paper
Intensity ratios of the redshifted and blueshifted components of Doppler-split emission lines of six bright planetary nebulae observed on high-dispersion coude plates taken by Wilson (1950) are used to study conditions within the expanding nebulae. Analysis of the mean ratios of the various lines for each nebula indicates the nebulae to be expanding uniformly with the exception of NGC 6210, for which the far side of the nebula is inferred to contain more matter than the near side. Variations of the red-to-blue intensity ratios with ionization potential reveal significant structure in the radial mass distribution for NGC 6210, NGC 6818 and NGC 7662. An attempt is also made to detect the presence of internal dust from the variation of the red/blue ratio with wavelength and extinction, and upper limits on internal dust concentrations in each nebula obtained.
Doughty J. R.
Kaler James B.
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