Monochromatic isophotometry of NGC 2440 and 7009

Details Monochromatic isophotometry of NGC 2440 and 7009 Monochromatic isophotometry of NGC 2440 and 7009

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.193..231p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 193, Oct. 1980, p. 231-243. Research supported by the Science Research

Astronomy and Astrophysics

Astronomy

20

Astronomical Maps, Astronomical Photometry, Planetary Nebulae, Abundance, Electronography, Isophotes, Nitrogen, Oxygen

Scientific paper

New monochromatic isophotal contour maps are presented for the planetary nebulae NGC 7009 and 2440. Electronographic exposures have been obtained through narrow band interference filters centered on the wavelengths of forbidden O III 5007 A, forbidden O II 3727 A, forbidden Ne III 3868 A, forbidden N II 6583 A, and H I 4861, 6563 A. The structure of both nebulae is shown to be characterized by bright unresolved condensations which exhibit enhanced low excitation emission. These are interpreted as being high density neutral mass components, and are thought to exist throughout the nebular shells on scales very much less than the 'seeing' limited resolution.

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