Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...345..306l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 345, Oct. 1, 1989, p. 306-326. Research supported by MPI.
Astronomy and Astrophysics
Astronomy
58
Cosmic Dust, Grain Size, Planetary Nebulae, Stellar Envelopes, Stellar Winds, Astronomical Catalogs, Infrared Astronomy, Interstellar Matter, Particle Collisions, Particle Size Distribution
Scientific paper
The IRAS data of 233 planetary nebulae (PNs) determining the properties of the dust contained in their envelopes have been analyzed. The main result is that the dust grains undergo substantial evolution during the lifetime of a PN. In particular, the grain size and the total dust mass decrease systematically with the nebular radius whereas the number of emitting grains increases. Two scenarios which can explain these results are discussed. A first possibility is that grains undergo processes which both 'erode' and 'shatter' them. It is argued that sputtering by fast atoms of a stellar wind and grain-grain collisions may plausibly produce such effects. Alernatively, the dust present in PNs may have a size distribution since the very beginning and large grains may be selectively destroyed during the PN evolution.
Lenzuni Paolo
Natta Antonella
Panagia Nino
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