TOPoS: III. An ultra iron-poor multiple CEMP system ?

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dc.contributor.authorCaffau, E.
dc.contributor.authorBonifacio, P.
dc.contributor.authorSpite, M.
dc.contributor.authorSpite, F.
dc.contributor.authorMonaco, L.
dc.contributor.authorSbordone, L.
dc.contributor.authorFrançois, P.
dc.contributor.authorGallagher, A.J.
dc.contributor.authorPlez, B.
dc.contributor.authorZaggia, S.
dc.contributor.authorLudwig, H.-G.
dc.contributor.authorCayrel, R.
dc.contributor.authorKoch, A.
dc.contributor.authorSteffen, M.
dc.contributor.authorSalvadori, S.
dc.contributor.authorKlessen, R.
dc.contributor.authorGlover, S.
dc.contributor.authorChristlieb, N.
dc.date.accessioned2023-08-28T21:44:00Z
dc.date.available2023-08-28T21:44:00Z
dc.date.issued2016-11
dc.descriptionIndexación: Scopus.es
dc.description.abstractAims. One of the primary objectives of the TOPoS survey is to search for the most metal-poor stars. Our search has led to the discovery of one of the most iron-poor objects known, SDSS J092912.32+023817.0. This object is a multiple system, in which two components are clearly detected in the spectrum. Methods. We have analysed 16 high-resolution spectra obtained using the UVES spectrograph at the ESO 8.2 m VLT telescope to measure radial velocities and determine the chemical composition of the system. Results. Cross correlation of the spectra with a synthetic template yields a double-peaked cross-correlation function (CCF) for eight spectra, and in one case there is evidence for the presence of a third peak. Chemical analysis of the spectrum obtained by averaging all the spectra for which the CCF showed a single peak found that the iron abundance is [Fe/H] = −4.97. The system is also carbon enhanced with [C/Fe] = +3.91 (A(C) = 7.44). From the permitted oxygen triplet we determined an upper limit for oxygen of [O/Fe] < +3.52 such that C/O > 1.3. We are also able to provide more stringent upper limits on the Sr and Ba abundances ([Sr/Fe] < +0.70, and [Ba/Fe] < +1.46, respectively).es
dc.description.urihttps://www.aanda.org/for-authors/author-information/open-access
dc.identifier.citationAstronomy and Astrophysics. Volume 595. 1 November 2016. Article number L6es
dc.identifier.doi10.1051/0004-6361/201629776
dc.identifier.issn0004-6361
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/52874
dc.language.isoenes
dc.publisherEDP Scienceses
dc.rights.licenseAtribution 4.0 International (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/deed.es
dc.subjectStars: Population IIes
dc.subjectStars: Abundanceses
dc.subjectBinaries: Spectroscopices
dc.subjectGalaxy: Abundanceses
dc.subjectGalaxy: Haloes
dc.titleTOPoS: III. An ultra iron-poor multiple CEMP system ?es
dc.typeArtículoes
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