Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-08-09
Astrophys.J. 451 (1995) L49
Astronomy and Astrophysics
Astrophysics
7 pages of plain TEX, no figures, to appear in Astrophysical Journal Letters
Scientific paper
10.1086/309687
We argue that extreme metal-poor stars show a high dispersion in metallicity, because their abundances are the outcome of very few supernova events. Abundance anomalies should appear because of the discrete range of progenitor masses. There is a natural metallicity threshold of $Z/Z_\odot\sim 10^{-4}$ below which one would expect to find very few, if any, halo stars. Similar reasoning is applied to lower mass systems, such as metal-poor compact blue galaxies and Lyman alpha absorption line clouds seen towards high redshift quasars, where a somewhat higher threshold is inferred.
Audouze Jean
Silk Joseph
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