Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.3201s&link_type=abstract
American Astronomical Society, 199th AAS Meeting, #32.01; Bulletin of the American Astronomical Society, Vol. 33, p.1355
Astronomy and Astrophysics
Astronomy
Scientific paper
Stars in the Galactic halo have heavy element abundances as low as 1/10,000 of that in the sun. Below Fe/H 1/300 of the solar value there is an increasing scatter in the relative abundances of various elements, including rare cases of very large overabundances of r-process elements perhaps synthesized in a single supernova. The overall distribution of r-process elements is thought to point to two early origins, one of them in primordial, supermassive stars. Metal-poor stars in nearby dwarf galaxies also give important information on early nucleosynthesis in metal-poor environments. Studies of the absorption lines in the spectra of QSOs at very high redshifts, particularly the Damped Lyman-alpha absorbers, are yielding new information on the relative abundances of several elements and on the scatter in different lines of sight. I summarize this information and describe how it can be combined with the results derived from old stars to produce a picture of where and how the first heavy elements were synthesized. This work was supported by the National Science Foundation under Grant AST-9900733.
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