Monochromatic isophotometry of planetary nebulae. II - Observations of NGC 6720

Details Monochromatic isophotometry of planetary nebulae. II - Observations of NGC 6720 Monochromatic isophotometry of planetary nebulae. II - Observations of NGC 6720

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.179..317r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 179, May 1977, p. 317-330. Research supported by the Science Research C

Astronomy and Astrophysics

Astronomy

45

Astronomical Photometry, Astronomical Spectroscopy, Electronography, Isophotes, Planetary Nebulae, Astronomical Maps, Forbidden Transitions, Interstellar Radiation, Line Spectra, Monochromatic Radiation

Scientific paper

Electronographic exposures in emission lines of He I, He II, and H I, in forbidden emission lines of O I, O II, O III, Ne III, N II, and S II, and in the continuum at 4788 A have been obtained for NGC 6720. The data are presented in the form of isophote maps. Measurements obtained from these and from single photometric scans along the major and minor axes are used in a discussion of the ionization structure and morphology of the nebula.

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