Chemical Abundance Analysis of the Extremely Metal-Poor Star HE 1300+0157

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dc.creatorFrebel, Anna
dc.creatorNorris, John E.
dc.creatorAoki, Wako
dc.creatorHonda, Satoshi
dc.creatorBessell, Michael S.
dc.creatorTakada-Hidai, Masahide
dc.creatorBeers, Timothy C.
dc.creatorChristlieb, Norbert
dc.date2006-12-06
dc.date.accessioned2026-07-07T11:00:23Z
dc.date.available2026-07-07T11:00:23Z
dc.descriptionWe present a detailed chemical abundance analysis of HE 1300+0157, a subgiant with [Fe/H]=-3.9. From a high-resolution, high-S/N Subaru/HDS spectrum we find the star to be enriched in C ([C/Fe]_1D ~ +1.4) and O ([O/Fe]_1D ~ +1.8). With the exception of these species, HE 1300+0157 exhibits an elemental abundance pattern similar to that found in many other very and extremely metal-poor stars. The Li abundance is lower than the Spite-plateau value, in agreement with expectation for its evolutionary status. Of particular interest, no neutron-capture elements are detected in HE 1300+0157. This type of abundance pattern has been found by recent studies in several other metal-poor giants. We suggest that HE 1300+0157 is an unevolved example of this group of stars, which exhibit high C abundances together with low (or absent) abundances of neutron-capture elements. Several potential enrichment scenarios are presented. The low neutron-capture elements, including Sr, Ba, and Pb, suggests that the carbon excess observed in HE 1300+0157 is not due to mass transfer across a binary system. Such a scenario is applied to carbon-rich objects with excesses of s-process elements. The normal observed Li abundance supports this interpretation. Most likely, the high levels of C and O were produced prior to the birth of this star. It remains unclear whether a single hypernova is responsible for its overall chemical pattern, or whether one requires a superposition of yields from a massive Population III object and a normal Type II SN. These scenarios provide important information on the C production in the early Universe, and on the formation of C-rich stars in the early Galaxy.
dc.description35 pages (emulateapj text + 16 figures), accepted for publication in ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0612160
dc.identifierhttp://arxiv.org/abs/astro-ph/0612160
dc.identifierAstrophys.J.658:534-552,2007
dc.identifierdoi:10.1086/511517
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187668
dc.subjectAstrophysics
dc.titleChemical Abundance Analysis of the Extremely Metal-Poor Star HE 1300+0157
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