Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...357..105m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 357, July 1, 1990, p. 105-112.
Astronomy and Astrophysics
Astrophysics
24
Globular Clusters, Interstellar Matter, Metallic Stars, Star Clusters, Star Formation, Stellar Evolution, Atomic Interactions, Cosmic Dust, Homogeneity, Main Sequence Stars, Milky Way Galaxy, Monatomic Gases, Turbulent Diffusion
Scientific paper
Various transport processes which may have affected the chemical homogeneity in protocluster clouds are examined. It is shown that the characteristic diffusion time scale associated with collisions between grains and gas atoms is considerably longer than that on which star formation is expected to occur. Collisions between large grains and gas atoms lead to mass segregation and metallicity gradients on a time scale comparable to the crossing time of the clusters in the Galaxy. One possible mechanism for inducing and maintaining chemical homogeneity is turbulent diffusion in the clouds. The mixing time scale required in this case is comparable to several internal dynamical time scales, longer than the evolutionary time scale of the most massive stars, and shorter than the Galactic orbital time scale of the clouds. Thus, metals in presently observed stars probably did not originate from upper main-sequence stars of a coeval generation.
Lin Douglas N. C.
Murray Stephen D.
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