Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99..672j&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, July 1987, p. 672-685.
Astronomy and Astrophysics
Astronomy
69
Abundance, Astronomical Spectroscopy, Charge Coupled Devices, Planetary Nebulae, Spectrophotometry, Spectrum Analysis, Data Reduction, Emission Spectra, Line Spectra, Spatial Distribution
Scientific paper
The authors have derived the spatial distribution of the electron temperature and density and the ionic abundances of O+, O++, N+, and S+ from CCD images of the planetary nebulae NGC 40 and NGC 6826 taken in the important emission lines of [O II], [O III], Hβ, [N II], and [S II]. Advantages of the imaging technique include complete spatial coverage and excellent spatial resolution, good light throughput, reduced effects of spatial averaging over filamented and knotted regions, elimination of the effects of atmospheric dispersion, and absolute spectrophotometry for objects having angular sizes of several arcmin. The disadvantages include additional effort to analyze the data, limited spectral coverage, and added difficulties in deblending nearby lines, removing the nebular continuum contribution, and correcting for nonphotometric conditions.
Africano John L.
Jacoby George H.
Quigley Robert J.
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