J/A+A/592/A111ivo://CDS.VizieR/J/A+A/592/A111doi:10.26093/cds/vizier.35920111CDSChantereau W.Charbonnel C.Meynet G.2016-08-08T06:57:08Z2016-08-08T07:54:41ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frastronomical-modelsglobular-star-clustersGlobular clusters host multiple populations of long-lived low-mass stars whose origin remains an open question. Several scenarios have been proposed to explain the associated photometric and spectroscopic peculiarities. They differ, for instance, in the maximum helium enrichment they predict for stars of the second population, which these stars can inherit at birth as the result of the internal pollution of the cluster by different types of stars of the first population. We present the distribution of helium-rich stars in present-day globular clusters as it is expected in the original framework of the fast-rotating massive stars scenario (FRMS) as first-population polluters. We focus on NGC 6752. We completed a grid of 330 stellar evolution models for globular cluster low-mass stars computed with different initial chemical compositions corresponding to the predictions of the original FRMS scenario for [Fe/H]=-1.75. Starting from the initial helium-sodium relation that allows reproducing the currently observed distribution of sodium in NGC 6752, we deduce the helium distribution expected in that cluster at ages equal to 9 and 13Gyr. We distinguish the stars that are moderately enriched in helium from those that are very helium-rich (initial helium mass fraction below and above 0.4, respectively), and compare the predictions of the FRMS framework with other scenarios for globular cluster enrichment.2016A&A...592A.111Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/592/A111CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/592/A111https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/592/A111http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/592/A111https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/592/A111https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/592/A111http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/592/A111GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/592/A111/listList of filesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMiniInitial mass of the modelsolMassphys.mass;meta.modelledfloatFileNameName of the file in subdirectory models (1)meta.id;meta.filechar