Evolution and nucleosynthesis of primordial low-mass stars

Ilenia Picardi, Alessandro Chieffi, Marco Limongi, Ofelia Pisanti, Gennaro Miele, Gainpiero Mangano, Gianluca Imbriani

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Abstract

We discuss in detail the evolutionary properties of low-mass stars (M less than or equal to 1 M-.) having metallicity lower than Z = 10(-6) from the pre - main sequence up to (almost) the end of the early asymptotic giant branch phase. We also discuss the possibility that the large [C/Fe], [N/Fe] observed on the surface of the most iron-poor star currently known, HE 0107 - 5240, could be attributed to the autopollution induced by the penetration of the He convective shell into the H-rich mantle during the He core flash of a low-mass, very low metallicity star. On the basis of a quite detailed analysis, we conclude that the autopollution scenario cannot be responsible for the observed chemical composition of HE 0107 - 5240.
Original languageEnglish
Pages (from-to)1035 - 1044
Number of pages10
JournalThe Astrophysical Journal
Volume609
Issue number2
Publication statusPublished - 2004

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