Carbon Rich Extremely Metal Poor Stars: Signatures of Population-III AGB stars in Binary Systems

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dc.creatorLau, H. B.
dc.creatorStancliffe, R. J.
dc.creatorTout, C. A.
dc.date2007-03-27
dc.date.accessioned2026-07-07T11:01:15Z
dc.date.available2026-07-07T11:01:15Z
dc.descriptionWe use the Cambridge stellar evolution code STARS to model the evolution and nucleosynthesis of zero-metallicity intermediate-mass stars. We investigate the effect of duplicity on the nucleosynthesis output of these systems and the potential abundances of the secondaries. The surfaces of zero-metallicity stars are enriched in CNO elements after second dredge up. During binary interaction, such as Roche lobe overflow or wind accretion, metals can be released from these stars and the secondaries enriched in CNO isotopes. We investigate the formation of the two most metal poor stars known, HE 0107-5240 and HE 1327-2326. The observed carbon and nitrogen abundances of HE 0107-5240 can be reproduced by accretion of material from the companion-enhanced wind of a seven solar star after second dredge-up, though oxygen and sodium are underproduced. We speculate that HE 1327-2326, which is richer in nitrogen and strontium, may similarly be formed by wind accretion in a later AGB phase after third dredge-up.
dc.description16 pages, 1 figure, 7 tables, accepted by MNRAS
dc.identifierhttps://arxiv.org/abs/astro-ph/0703685
dc.identifierhttp://arxiv.org/abs/astro-ph/0703685
dc.identifierMon.Not.Roy.Astron.Soc.378:563-568,2007
dc.identifierdoi:10.1111/j.1365-2966.2007.11773.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187900
dc.subjectAstrophysics
dc.titleCarbon Rich Extremely Metal Poor Stars: Signatures of Population-III AGB stars in Binary Systems
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