Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...410..251k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 410, no. 1, p. 251-259.
Astronomy and Astrophysics
Astrophysics
16
Asymptotic Giant Branch Stars, Planetary Nebulae, Protoplanets, Stellar Cores, Stellar Evolution, Hydroxyl Emission, Interstellar Extinction, Stellar Envelopes, Stellar Spectrophotometry
Scientific paper
Preliminary evaluations are made of the time taken by the circumstellar dust shells to become optically thin at visible and near-IR wavelengths, following the termination of the superwind envelope ejection. The typical thinning times are estimated at 1000 and 100 yr at H-alpha and Br-alpha wavelengths, respectively. Results of observations are then presented for a sample of candidate transition objects. The results imply transition times in excess of 1000 yrs for most post-AGB stars, and therefore the transition time may be comparable to the nebular age in a fair fraction of known planetary nebulae.
Kaeufl Hans U.
Renzini Alvio
Stanghellini Letizia
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