Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apjs...80..347v&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 80, no. 1, May 1992, p. 347-368. Research supported by NSERC.
Astronomy and Astrophysics
Astronomy
22
Asymptotic Giant Branch Stars, Planetary Nebulae, Stellar Evolution, Stellar Models, Stellar Spectra, Color-Color Diagram, Far Infrared Radiation, Infrared Astronomy Satellite, Stellar Envelopes
Scientific paper
The paper presents initial results for models of the overall spectral evolution of planetary nebulae, with emphasis on the FIR emission of the remnant AGB dust shells. The models combine a stellar/nebular spectrum, either an approximate model assuming the nebula to be strongly ionization-bounded or a proper photoionization model, with a dust radiative transfer calculation. The model results are compared to the IRAS color-color diagram, and it is found that the Schoenberner (1982, 1983) 0.64 solar mass central star model evolves too slowly to match the observations. The first results indicate that a range of initial 10-micron dust optical depths from 5 to 20 plus a faster evolving central star gives a reasonable match to the IRAS colors. The predicted evolution of the 8 to 23 micron spectrum qualitatively resembles the available IRAS low-resolution spectrometer data.
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