Mathematics – Logic
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98..488g&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, May 1986, p. 488-498. Research supported by the Uni
Mathematics
Logic
11
Astronomical Spectroscopy, Electron Density (Concentration), Electron Energy, Planetary Nebulae, Southern Sky, Data Correlation, Forbidden Transitions, Nitrogen, Oxygen Spectra
Scientific paper
Electron temperatures and densities for 14 bright southern planetary nebulae, obtained from data previously published, are presented here. It is found that the difference between the logarithmic electron densities obtained from the ratio of nebular lines and from the ratio of auroral or transauroral lines to nebular lines is linearly correlated with the electron densities. It is also found that the ratio of the temperatures in the O III and N II forbidden line regions, T(H)/T(L), is linearly correlated with the degree of excitation, measured through the intensity of He II 4686A. The relation is double valued, with values of T(H)/T(L) both larger and smaller than 1 for the same degree of excitation. Up to this moment, no physical parameter giving a unique correlation with T(H)/T(L) has been found.
Cortes G.
Gutierrez-Moreno Adelina
Moreno Heidi
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