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First Stars III
Contact:
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Talk
Title: Abundance ratios in Carbon-enhanced metal-poor stars and the Intermediate Mass IMF Presenter: Jennifer Johnson Abstract: The Intial Mass Function in the early Universe of stars between 1 and 8 solar masses is difficult to determine because they neither survive to the present day nor are the first to pollute the interstellar medium with distinctive nucleosynthesis. However \"chemically isolated\" binary systems, where the high mas stars has polluted a lower mass (=still surviving) companion with its freshly created elements during the AGB phase. Because different mass AGB stars produce different ratios of the light elements,in particular [C/N] and [Li/C], the mass of the original primary may be recovered. I will present data on [C/N] and [Li/C] ratios in metal-poor stars in binary systems. The current results imply that the majority of stars in binary systems were between 2-3 solar masses. There are possible biases in thisresult, including the preferred mass ratios of binaries, that can be studied with new samples, as I will show. I will also discuss what other elements, in particular the neutron-capture elements, may hold the key to the massof the polluting AGB stars.
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