J/ApJ/754/L38ivo://CDS.VizieR/J/ApJ/754/L38doi:10.26093/cds/vizier.17549038CDSJohnson C.I.Pilachowski C.A.2021-08-04T12:53:33Z2014-04-04T16:15:51ZCDS support team

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

cds-question@unistra.frchemical-abundancesgiant-starsradial-velocityeffective-temperatureglobular-star-clustersWe present O, Na, and Fe abundances, as well as radial velocities, for 113 red giant branch (RGB) and asymptotic giant branch (AGB) stars in the globular cluster M13. The abundances and velocities are based on spectra obtained with the WIYN-Hydra spectrograph, and the observations range in luminosity from the horizontal branch (HB) to RGB tip. The results are examined in the context of recent globular cluster formation scenarios. We find that M13 exhibits many key characteristics that suggest its formation and chemical enrichment are well described by current models. Some of these observations include the central concentration of O-poor stars, the notable decrease in [O/Fe] (but small increase in [Na/Fe]) with increasing luminosity that affects primarily the "extreme" population, the small fraction of stars with halo-like composition, and the paucity of O-poor AGB stars. In agreement with recent work, we conclude that the most O-poor M13 giants are likely He-enriched and that most (all?) O-poor RGB stars evolve to become extreme HB and AGB-manqu\'e stars. In contrast, the "primordial" and "intermediate" population stars appear to experience standard HB and AGB evolution.2012ApJ...754L..38Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/754/L38CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/248 : UBV photometry and proper motions in M13 (Kadla, 1966)IV/26 : Hercules Messier 13 (M13) photometry (Ludendorff, 1905)J/AJ/139/2374 : Evolved stars in M13 (Sandquist+, 2010)J/AJ/137/4282 : Red giant stars in clusters. II. M13 and M92 (Meszaros+, 2009)J/A+A/505/139 : Abundances of red giants in 17 GCs (Carretta+, 2009)J/A+A/505/117 : Abundances of red giants in 15 GCs (Carretta+, 2009)J/ApJ/638/1018 : Equivalent widths for giant stars in M13 and M71 (Yong+, 2006)J/AJ/129/303 : Abundances of stars in M3 and M13 (Cohen+, 2005)J/AJ/127/1579 : Abundances of faint M13 stars (Briley+, 2004)J/A+A/398/541 : VI light-curves of the variable stars in M13 (Kopacki+, 2003)J/AJ/122/3219 : M3 and M13 CCD BV photometry (Rey+, 2001)J/AJ/120/1364 : Abundances in M3 and M13 (Cavallo+, 2000)J/AJ/113/669 : Stars in M13 core (Cohen+ 1997)J/AJ/113/279 : Proton Capture Chains. II (Kraft+ 1997)J/AJ/112/545 : Proton capture chains in GCs. I. (Pilachowski+ 1996)J/A+AS/102/397 : Colour magnitude diagram of M13 (Guarnieri+ 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/754/L38https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/754/L38http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/754/L38https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/754/L38https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/754/L38http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/754/L38GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/754/L38/table1 (Basic data and results)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/754/L38/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/754/L38/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/754/L38/table1?GETtext/xml+votable180.050000true250.4027111136.443213890.0055555555555555566/94363.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/754/L38?format=asciidefaultJ/ApJ/754/L38/table1Basic data and resultsSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (1)meta.id;meta.maincharANameAlternate namemeta.idcharnullableRAJ2000Right Ascension in decimal degrees (J2000) (2)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000) (2)degpos.eq.dec;meta.mainVmag[12/15.3] V band magnitude (2)magphot.mag;em.opt.VfloatKmag[8.3/14.4] 2MASS K_S_ band magnitudemagphot.mag;em.IR.KfloatlogL[1.6/3.3] Log of luminositylog(solLum)phys.luminosityfloatTeff[3895/5195] Effective temperatureKphys.temperature.effectiveintlog(g)[0.4/2.5] Log of the surface gravitylog(cm.s**-2)phys.gravityfloat[Fe/H][-1.8/-1.3] Average [Fe/H] metallicitylog(Sun)phys.abund.Z;stat.meanfloatVt[1.3/2.5] Turbulent velocitykm/sphys.veloc.microTurbfloat[FeI/H]Fe I to H abundancelog(Sun)phys.abund.Fefloat[FeII/H]? Fe II to H abundancelog(Sun)phys.abund.Fefloatnullable[O/Fe][-1.1/0.8]? O to Fe abundancelog(Sun)phys.abund.Fefloatnullable[Na/Fe][-0.7/0.8]? Na to Fe abundancelog(Sun)phys.abund.FefloatnullableRVel[-258.3/-230.1] Radial velocitykm/sphys.veloc;pos.heliocentricfloatM13Cross-match with M13 catalogs (II/248, IV/26) within 3"meta.ref.urlintnullable2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246) within 1"meta.ref.urlchar