Theoretical models of planetary nebulae. II. NGC 4361, an unusual high-excitation nebula

Details Theoretical models of planetary nebulae. II. NGC 4361, an unusual high-excitation nebula Theoretical models of planetary nebulae. II. NGC 4361, an unusual high-excitation nebula

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ap%26ss..64..347a&link_type=abstract

Astrophysics and Space Science, vol. 64, no. 2, Aug. 1979, p. 347-357. Research supported by the Australian Research Grants Com

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Astronomical Models, Astronomical Spectroscopy, Chemical Composition, Planetary Nebulae, Argon, Computation, Electron Energy, Excitation, Helium, Inhomogeneity, Ionizing Radiation, Neon, Nitrogen, Optical Thickness, Oxygen, Temperature Distribution

Scientific paper

In the present paper, new spectroscopic data obtained for the NGC 4361 low-density inhomogeneous extremely high excitation nebula are reinterpreted on the basis of nebula models that permit estimation of its chemical composition. These are vague indications that helium may be slightly more abundant than in an ordinary planetary. Nitrogen, oxygen, and neon appear to be deficient by a factor of 3 or 4 as compared to an ordinary planetary nebula. Argon is likewise deficient, but the factor is more difficult to establish, partly due to the high inhomogeneity of the nebula and partly due to uncertainties in cross sections. The nebula is optically thin in the hydrogen continuum. In contrast to other high-excitation nebulae, the low-excitation condensations appear to have been destroyed by penetration of ionizing radiation.

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