Abundance correlations in unevolved stars, and the mixing of the interstellar medium

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Abundance, Astrophysics, Chemical Composition, Heavy Elements, Interstellar Matter, Main Sequence Stars, Chemical Evolution, Correlation, Neutrons, Stellar Evolution, Stellar Interiors, Stellar Mass Ejection

Scientific paper

This letter demonstrates that correlations of a certain type should result for heavy elements synthesized in main-sequence stars by slow neutron capture (the s-process) and ejected into the interstellar medium, provided the interstellar gas undergoes complete mixing before stars of the next generation are formed. It is assumed that elements lighter than iron and the iron-group elements are synthesized under nonequilibrium conditions and that a chain of successive slow neutron captures occurs. An analytical model of galactic chemical evolution is constructed which takes into account the effect of the time-variable abundance of s-process elements in the interstellar medium on the synthesis of elements in stellar interiors.

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