Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ap%26ss..65..313d&link_type=abstract
(Workshop on Thermodynamics and Kinetics of Dust Formation in the Space Medium, Houston, Tex., Sept. 6-8, 1978.) Astrophysics an
Astronomy and Astrophysics
Astrophysics
45
Astrophysics, Cosmic Dust, Cosmology, Interstellar Matter, Nucleation, Carbon, Clumps, Grains, Impurities, Kinetic Theory
Scientific paper
The paper presents the theory of homogeneous nucleation and its application to the formation of interstellar grains. Thermodynamics of very small clusters shows that at least for carbon and metals, the free energies of N-mers may be expressed in terms of a parameter thetaN which is nearly independent of cluster size N. Estimates of thetaN from the Lothe-Pound theory disagree with the experimental observations for N less than 10, and it is preferable to approximate thetaN from bulk properties. Approximate formulae are given for the critical supercooling, the critical cluster size and the mean final cluster size; the nucleation of grains in planetary nebulae, novae, and the red giant outflows is discussed. It is shown that the Pt-rich nuggets in the Allende meteorite could have been formed by homogeneous nucleation in the primordial solar nebula, but not in a supernova explosion.
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