Abundances in a sample of turnoff and subgiant stars in NGC 6121 (M 4)

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dc.contributor.authorSpite, M.
dc.contributor.authorSpite, F.
dc.contributor.authorGallagher, A.J.
dc.contributor.authorMonaco, L.
dc.contributor.authorBonifacio, P.
dc.contributor.authorCaffau, E.
dc.contributor.authorVillanova, S.
dc.date.accessioned2023-09-15T20:25:06Z
dc.date.available2023-09-15T20:25:06Z
dc.date.issued2016-10
dc.descriptionIndexación: Scopus.es
dc.descriptionAcknowledgements. This work was supported by the “Programme National de Physique Stellaire” (CNRS-INSU), and it made use of SIMBAD (CDS, Stras bourg). E.C. acknowledges the FONDATION MERAC for funding her fellow ship and A.J.G. acknowledges l’Observatoire de Paris for funding his fellowship. L.M. acknowledges support from “Proyecto interno” of the Universidad Andres Bello.
dc.description.abstractContext. The stellar abundances observed in globular clusters show complex structures, currently not yet understood. Aims. The aim of this work is to investigate the relations between the abundances of different elements in the globular cluster M 4, selected for its uniform deficiency of iron, to explore the best models explaining the pattern of these observed abundances. Moreover, in turnoff stars, the abundances of the elements are not suspected to be affected by internal mixing. Methods. In M 4, using low and moderate resolution spectra obtained for 91 turnoff (and subgiant) stars with the ESO FLAMES Giraffe spectrograph, we have extended previous measurements of abundances (of Li, C and Na) to other elements (C, Si, Ca, Sr and Ba), using model atmosphere analysis. We have also studied the influence of the choice of the microturbulent velocity. Results. Firstly, the peculiar turnoff star found to be very Li-rich in a previous paper does not show any other abundance anomalies relative to the other turnoff stars in M 4. Secondly, an anti-correlation between C and Na has been detected, the slope being significative at more than 3σ. This relation between C and Na is in perfect agreement with the relation found in giant stars selected below the RGB bump. Thirdly, the strong enrichment of Si and of the neutron-capture elements Sr and Ba, already observed in the giants in M 4, is confirmed. Finally, the relations between Li, C, Na, Sr and Ba constrain the enrichment processes of the observed stars. Conclusions. The abundances of the elements in the turnoff stars appear to be compatible with production processes by massive AGBs, but are also compatible with the production of second generation elements (like Na) and low Li produced by, for example, fast rotating massive stars.es
dc.description.urihttps://www.aanda.org/articles/aa/full_html/2016/10/aa28759-16/aa28759-16.html
dc.identifier.citationAstronomy and Astrophysics. Volume 594. 1 October 2016. Article number A79es
dc.identifier.doi10.1051/0004-6361/201628759
dc.identifier.issn0004-6361
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/53262
dc.language.isoenes
dc.publisherEDP Scienceses
dc.subjectStars: Abundanceses
dc.subjectGalaxy: Abundanceses
dc.subjectGlobular Clusters: Individual: M 4es
dc.subjectGalaxy: Haloes
dc.titleAbundances in a sample of turnoff and subgiant stars in NGC 6121 (M 4)es
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