The temperatures of the nuclei of high-excitation planetary nebulae

Details The temperatures of the nuclei of high-excitation planetary nebulae The temperatures of the nuclei of high-excitation planetary nebulae

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ap%26ss.149..343g&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 149, no. 2, Nov. 1988, p. 343-356.

Astronomy and Astrophysics

Astrophysics

18

Emission Spectra, High Temperature, Line Spectra, Planetary Nebulae, H Beta Line, Helium, Nuclei, Positive Ions

Scientific paper

An empirical relationship between the ratio of the intensities of emission lines in spectra of planetary nebulae, 4686 He II/Hβ and N1+N2[O III]/4868 He II, is established. A new statistical temperature scale based on this empirical relationship is proposed for the determination of lower limits of the temperatures of the nuclei of planetary nebulae. The well-known method 4686 He II/Hβ gives the upper level of the temperature of the nucleus. A simultaneous application of both methods has been carried out for 97 planetary nebulae, in order to determine both the upper and lower limits of the temperature of their nuclei. A new quantitative system for the determination of excitation classes of nebulae is proposed.

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