Abstract
ABSTRACT 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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Publications of the Astronomical Society of the Pacific
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
