Excitation class of nebulae - an evolution criterion?

Details Excitation class of nebulae - an evolution criterion? Excitation class of nebulae - an evolution criterion?

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.181...73g&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 181, no. 1, July 1991, p. 73-88.

Astronomy and Astrophysics

Astrophysics

6

Emission Spectra, Planetary Nebulae, Stellar Evolution, Stellar Spectra, Abundance, Classifying, Forbidden Transitions, H Beta Line, Helium, Oxygen Spectra

Scientific paper

A principally new quantitative system of the classification of the spectra of planetary nebulae is proposed. Spectral class of excitation class of the nebula p is determined according to the relative intensities of forbidden mission lines (N1 + N2) O III/4686 He II and (N1 + N2) O III/H-beta. The excitation classes are obtained for 142 planetary nebulae of all classes - low (p = 1-3), middle (p = 4-8), and high (p = 9-12/+/). An empirical relationship between excitation class p, as an independent parameter, admit an evolutionary interpretation. It is shown that after reaching the highest class of excitation p = 12(+) the nebulae decrease their class of excitation with the further increases of sizes.

Affiliated with

Also associated with

No associations

Rating

Excitation class of nebulae - an evolution criterion? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Excitation class of nebulae - an evolution criterion?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Excitation class of nebulae - an evolution criterion? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-860825