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Prompt Iron Enrichment, Two r-Process Components, and Abundances in Very Metal-Poor Stars

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G. J. Wasserburg1 and Y.-Z. Qian2

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We present a model to explain the wide range of abundances for heavy r-process elements (mass number A > 130) at low [Fe/H]. This model requires rapid star formation and/or an initial population of supermassive stars in the earliest condensed clots of matter in order to provide a prompt or initial Fe inventory. Subsequent Fe and r-process enrichment was provided by two types of supernovae: one producing heavy r-elements with no Fe on a rather short timescale and the other producing light r-elements (A ≤ 130) with Fe on a much longer timescale.


Subject headings

Galaxy: evolution; stars: abundances; stars: Population II


Dates

Issue 1 (2000 January 20)

Received 1999 October 19, accepted for publication 1999 November 29

Published 1999 December 17



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