Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979sva....23..297n&link_type=abstract
Astronomicheskii Zhurnal, vol. 56, May-June 1979, p. 532-540. In Russian.
Astronomy and Astrophysics
Astrophysics
1
Astronomical Spectroscopy, Astrophysics, Interstellar Extinction, Line Spectra, Planetary Nebulae, Astronomical Catalogs, Electron Density (Concentration), Emission Spectra, Forbidden Bands, Optical Thickness
Scientific paper
Absolute emission-line fluxes in the wavelength range from 6000 to 11,000 A for nine planetary nebulae are used to estimate several physical parameters of the objects. The interstellar extinction toward these planetaries is estimated on the basis of line pairs due to a single upper level (the Paschen and Balmer series of hydrogen and the violet and IR components of forbidden S II). The nebular electron densities and temperatures are determined by employing the absolute fluxes in forbidden lines of S III, Ar III, N II, S II, O II, and O I. The He I 3889-A optical depth is obtained from measurements of the absolute intensities of the triplet lines at 3889, 7065, and 10,830 A. This optical depth is found to be significantly greater than unity for all nine planetaries.
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