Mathematics – Probability
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229..265h&link_type=abstract
Astrophysical Journal, Part 1, vol. 229, Apr. 1, 1979, p. 265-273. NSF-supported research.
Mathematics
Probability
1
Chemical Evolution, Interstellar Matter, Metals, Stellar Evolution, Stellar Models, Cosmic Dust, Flow Velocity, Galactic Evolution, Giant Stars, Interstellar Gas, Metallic Stars, Probability Distribution Functions
Scientific paper
A model for chemical evolution which predicts the observed low stellar metal abundances is presented. It features different rates of incorporation of gas and dust into stars and local conservation of matter. In its simplest form, one considers mass exchange between three matter reservoirs: gas, dust, and stars. The dust acts as an efficient storage depot for most of the metals produced by evolving stars. The model can represent the cumulative probability function for metals observed in disk stars. It predicts that the local dust-to-gas ratio should be about a few percent, and that extremely metal-rich stars should be rare in all parts of our Galaxy.
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