Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...126..299t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 126, no. 2, Oct. 1983, p. 299-306.
Astronomy and Astrophysics
Astrophysics
23
Photoionization, Planetary Nebulae, Stellar Evolution, Stellar Models, H Beta Line, Radiative Recombination, Stellar Luminosity, Stellar Mass, Time Dependence
Scientific paper
Time-dependent photoionization models of a planetary nebula with a 1.2 solar mass nucleus are presented. When the central star is luminous, the nebula is quickly ionized by an intense flux of ionizing photons. Exhaustion of nuclear fuel causes the central star's luminosity to drop, with the reduced flux of ionizing radiation still maintaining ionization in the nebula's innermost layers. The outer regions recombine and cool off in a recombination epoch much longer than the photoionization epoch. Time-dependent effects observable during the recombination epoch include a double-shell structure in the nebula consisting of an inner, bright, high-excitation ring surrounded by a faint, extended, low-excitation halo. Total fluxes of emission lines, especially of lower excitation, are enhanced above their equilibrium values. The effective temperature derived from forbidden N II lines is appreciably lower than that from forbidden O III lines.
No associations
LandOfFree
Planetary nebulae with massive nuclei. I - Time-dependent photoionization models 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 Planetary nebulae with massive nuclei. I - Time-dependent photoionization models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Planetary nebulae with massive nuclei. I - Time-dependent photoionization models will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1191760