J/A+A/585/A86ivo://CDS.VizieR/J/A+A/585/A86doi:10.26093/cds/vizier.35850086CDSHendricks B.Boeche C.Johnson C.I.Frank M.J.Koch A.Mateo M.,Bailey III J.I.2018-01-08T10:27:53Z2016-05-10T13:38:10ZCDS support team

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

cds-question@unistra.frgalaxiesglobular-star-clusterschemical-abundancesThe globular cluster H4, located in the center of the Fornax dwarf spheroidal galaxy, is crucial for understanding the formation and chemical evolution of star clusters in low-mass galactic environments. H4 is peculiar because the cluster is significantly more metal-rich than the galaxy's other clusters, is located near the galaxy center, and may also be the youngest cluster in the galaxy. In this study, we present detailed chemical abundances derived from high-resolution (R~28000) spectroscopy of an isolated H4 member star for comparison with a sample of 22 nearby Fornax field stars. We find the H4 member to be depleted in the alpha-elements Si, Ca, and Ti with [Si/Fe]=-0.35+/-0.34, [Ca/Fe]=+0.05+/-0.08, and [Ti/Fe]=-0.27+/-0.23, resulting in an average [{alpha}/Fe]=-0.19+/-0.14. If this result is representative of the average cluster properties, H4 is the only known system with a low [{alpha}/Fe] ratio and a moderately low metallicity embedded in an intact birth environment. For the field stars we find a clear sequence, seen as an early depletion in [{alpha}/Fe] at low metallicities, in good agreement with previous measurements. H4 falls on top of the observed field star [{alpha}/Fe] sequence and clearly disagrees with the properties of Milky Way halo stars. We therefore conclude that within a galaxy, the chemical enrichment of globular clusters may be closely linked to the enrichment pattern of the field star population. The low [{alpha}/Fe] ratios of H4 and similar metallicity field stars in Fornax give evidence that slow chemical enrichment environments, such as dwarf galaxies, may be the original hosts of alpha-depleted clusters in the halos of the Milky Way and M31.2016A&A...585A..86Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/585/A86CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/585/A86https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/585/A86http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/585/A86https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/585/A86https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/585/A86http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/585/A86GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/585/A86/sample (Basic parameters (table A1) and chemical abundances (tables A2 and A3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/585/A86/sample?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/585/A86/sample?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/585/A86/sample?GETtext/xml+votable180.050000true40.0422917-34.53023060.0055555555555555566/35968-35969https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/585/A86?format=asciidefaultJ/A+A/585/A86/sampleBasic parameters (table A1) and chemical abundances (tables A2 and A3)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar designationmeta.id;meta.maincharn_Star[*] Note on Star (G1)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainGroup[AB] Group (2)meta.idcharVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmag? rms uncertainty on Vmagmagstat.error;phot.mag;em.opt.VfloatnullableV-IV-I colour indexmagphot.color;em.opt.V;em.opt.Ifloate_V-I? rms uncertainty on V-Imagstat.error;phot.color;em.opt.Vfloatnullablemsep? Separation index (3)pos.angDistance;src.orbitalfloatnullableS/NSignal-to-noise ratio (4)stat.snrfloatDleffEffective wavelength range {Delta}{lambda}_eff_ (5)0.1nmem.wl.effectivefloatvVelocitykm/sphys.velocfloate_vrms uncertainty on vkm/sstat.errorfloat[Fe/H]Abundance [Fe/H]phys.abund.Fefloatb_[Fe/H]? Lower value of [Fe/H] intervalphys.abund.FefloatnullableB_[Fe/H]? Upper value of [Fe/H] intervalphys.abund.Fefloatnullable[Ca/H]? Abundance [Ca/H]phys.abundfloatnullableb_[Ca/H]? Lower value of [Ca/H] intervalphys.abundfloatnullableB_[Ca/H]? Upper value of [Ca/H] intervalphys.abundfloatnullable[Ti/H]? Abundance [Ti/H]phys.abundfloatnullableb_[Ti/H]? Lower value of [Ti/H] intervalphys.abundfloatnullableB_[Ti/H]? Upper value of [Ti/H] intervalphys.abundfloatnullable[V/H]? Abundance [V/H]phys.abundfloatnullableb_[V/H]? Lower value of [V/H] intervalphys.abundfloatnullableB_[V/H]? Upper value of [V/H] intervalphys.abundfloatnullable[Cr/H]? Abundance [Cr/H]phys.abundfloatnullableb_[Cr/H]? Lower value of [Cr/H] intervalphys.abundfloatnullableB_[Cr/H]? Upper value of [Cr/H] intervalphys.abundfloatnullable[Co/H]? Abundance [Co/H]phys.abundfloatnullableb_[Co/H]? Lower value of [Co/H] intervalphys.abundfloatnullableB_[Co/H]? Upper value of [Co/H] intervalphys.abundfloatnullable[Ni/H]? Abundance [Ni/H]phys.abundfloatnullableb_[Ni/H]? Lower value of [Ni/H] intervalphys.abundfloatnullableB_[Ni/H]? Upper value of [Ni/H] intervalphys.abundfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar