Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...228..521s&link_type=abstract
Astrophysical Journal, Part 1, vol. 228, Mar. 1, 1979, p. 521-530.
Astronomy and Astrophysics
Astrophysics
9
Cosmic Dust, Iron, Planetary Nebulae, Stellar Evolution, Abundance, Collision Parameters, Condensation, Drift Rate, Stellar Models, Vaporizing
Scientific paper
The observed degree of iron depletion in planetary nebulae (PN) is used as a constraint on PN formation in an attempt to distinguish between an 'ejection' model and a 'wind' model. In the ejection model the entire shell is ejected in a single event; the wind model envisions PN formation as resulting from a relatively steady phase of rapid mass loss over an extended period. Proposed explanations for the existence of dust in PN are reviewed, and the condensation of iron in PN is considered, along with processes that may account for the observed small fraction of iron that remains in the gas. The results indicate that condensation of refractory elements in PN is to be expected in either model and that only grain-grain collisions leading to shattering and partial vaporization can successfully explain the gas-phase iron abundances. This process is shown to be effective only in the wind model.
Scalo John M.
Shields Gregory A.
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