We discuss in detail the evolutionary properties of low-mass stars (M ≤ 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.
Evolution and nucleosynthesis of primordial low-mass stars / Picardi, I.; Chieffi, A.; Limongi, M.; Pisanti, Ofelia; Miele, Gennaro; Mangano, G.; Straniero, O.; Imbriani, Gianluca. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - STAMPA. - 609:2(2004), pp. 1035-1044. [10.1086/421254]
Evolution and nucleosynthesis of primordial low-mass stars
I. PICARDI;PISANTI, OFELIA;MIELE, GENNARO;G. MANGANO;IMBRIANI, GIANLUCA
2004
Abstract
We discuss in detail the evolutionary properties of low-mass stars (M ≤ 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
