Mathematics – Logic
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phst..133a4035f&link_type=abstract
Physica Scripta, Volume 133, Issue , pp. 014035 (2008).
Mathematics
Logic
Scientific paper
Constraints on the chemical yields of the first stars and supernova can be derived by examining the abundance patterns of different types of metal-poor stars. The concept of stellar archaeology, that stellar abundances reflect the chemical composition of the earliest times, is a vital assumption. The accretion history of a sample of metal-poor stars has been re-examined in a cosmological context and found to have no impact on the observed abundances. Predictions are made for the lowest possible Fe and Mg abundances observable in the Galaxy, [Fe/H]min=- 7.3 and [Mg/H]min=- 6.0. The absence of stars below these values is so far consistent with a top-heavy initial mass function (IMF). These predictions are directly relevant for future surveys and the next generation of telescopes. The most Fe-poor stars, such as HE 1327 2326, are used to constrain the chemical yields of 25 to 60 Modot SNe. The nucleosynthetic yields of 8 10 Modot SNe can be probed with r-process-enhanced metal-poor stars, such as HE 1523 0901, which display large amounts of neutron-capture elements. Constraints on the chemical evolution of faint dSph galaxies can soon be obtained from detailed analyses of newly discovered extremely metal-poor stars in several systems.
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