Evolution and Nucleosynthesis of Primordial Low‐Mass Stars

Ilenia Picardi, Alessandro Chieffi, Marco Limongi, Ofelia Pisanti, Gennaro Miele, Gianpiero Mangano, Gianluca Imbriani
2004 Astrophysical Journal  
We discuss in detail the evolutionary properties of low mass stars M< 1 M(Solar) having metallicity lower than Z=10^(-6) from the pre- main sequence up to (almost) the end of the Asymptotic Giant Branch phase. We also discuss the possibility that the large [C,N/Fe] observed on the surface of the most Iron poor star presently known, HE0107-5240, may 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
more » ... e 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 HE0107-5240.
doi:10.1086/421254 fatcat:vaturcx7pbfexdfkngecalphji