J/AJ/161/288ivo://CDS.VizieR/J/AJ/161/288doi:10.26093/cds/vizier.51610288CDSGerber J.M.Friel E.D.Vesperini E.2022-01-17T12:34:19Z2021-07-28T09:12:10ZCDS support team

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

cds-question@unistra.frglobular-star-clustersradial-velocityvisible-astronomybroad-band-photometryinfrared-photometryeffective-temperaturechemical-abundancesWe present results from a study of 94 red giant stars in the globular cluster M53. We use low-resolution spectra to measure the strength of CN and CH features at ~3800 and 4300{AA}, respectively. The strengths of these features are used to classify stars into a CN-enhanced and CN-normal population and to measure C and N abundances in all 94 stars. We find the red giant branch stars to be evenly split between the two populations identified, and observe the presence of CN-enhanced stars on the asymptotic giant branch. In addition, we identify five CH star candidates based on the strength of their CN and CH band features, and the presence of a P-branch in their CH band. We compare our identification of multiple populations to those based on the Na-O anticorrelation and pseudo-color indices in Hubble Space Telescope UV photometry, and find general agreement between all three methods. Our large sample size also allows us to study the radial distribution of each population, and we find that the CN-enhanced population is more centrally concentrated. We use our C and N measurements to compare the evolutionary changes in these elements as a function of magnitude between the two populations, and show that both populations experience similar evolutionary changes to the surface abundances of C and N. Finally, we calculate C+N+O abundances for each population and compare them to similar measurements made in M10; we find that in both clusters, CN-enhanced stars have a slightly enhanced C+N+O ({Delta}(C+N+O)~0.2dex).2021AJ....161..288Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/161/288CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/195 : Globular Clusters in the Milky Way (Harris, 1996)J/AJ/116/1775 : BV photometry of M53 (Rey+, 1998)J/A+A/358/547 : M53 variable stars V light curves (Kopacki, 2000)J/A+A/505/117 : Abundances of red giants 15 globular clusters (Carretta+, 2009)J/A+A/505/139 : Abundances of red giants in 17 glob. clusters (Carretta+, 2009)J/A+A/524/A44 : CN and CH line strengths in 12 globulars (Pancino+, 2010)J/AJ/142/126 : CN and CH in SDSS Galactic globular clusters (Smolinski+, 2011)J/A+A/548/A107 : U,V photometry in M2 (NGC 7089) (Lardo+, 2012)J/AJ/149/53 : RVel of 12 Milky Way globular clusters (Kimmig+, 2015)J/ApJ/801/125 : Carbon in red giants in GCs and dSph galaxies (Kirby+, 2015)J/MNRAS/446/3319 : Line list for the NGC 1851 stars (Yong+, 2015)J/MNRAS/450/815 : Red giants in NGC 5286 (Marino+, 2015)J/ApJ/824/5 : Chemical abundances in NGC 5024 (M53) (Boberg+, 2016)J/AJ/156/6 : Light element abund. of RGB & AGB stars in M10 (Gerber+, 2018)J/MNRAS/475/257 : AGB subpopulations in NGC 6397 (MacLean+, 2018)J/AJ/157/154 : Abundances of RGs in Galactic globular clusters (Gerber+, 2019)J/AJ/158/14 : Stellar pop. of globular clusters using APOGEE (Nataf+, 2019)J/MNRAS/482/5138 : Galactic GC mean pms & velocities (Baumgardt+, 2019)J/MNRAS/484/2832 : Proper motions Milky Way globular clusters (Vasiliev, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/161/288https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/161/288http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/161/288https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/161/288https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/161/288http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/161/288GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/161/288/table1 (Stars measured in M53)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/161/288/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/161/288/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/161/288/table1?GETtext/xml+votable180.050000true198.1913611118.1918450.0055555555555555566/27975 27981 27986 279928.650015785639275e-20 9.710690472292815e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/161/288?format=asciiOpticalInfrareddefaultJ/AJ/161/288/table1Stars measured in M53MemM53 member? (y)es or (n)ometa.code.membercharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentifiermeta.id;meta.mainintRAJ2000[198/199] Right Ascension (J2000) (1)degpos.eq.ra;meta.mainDEJ2000[18/19] Declination (J2000) (1)degpos.eq.dec;meta.mainRVel[-81/29] Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricintVmag[13.78/17.34] Apparent V band magnitude (1)magphot.mag;em.opt.VfloatVMAG[-2.54/1.02] Absolute V band magnitude (2)magphys.magAbsfloatKmag[10.44/100] Apparent 2MASS Ks band magnitudemagphot.mag;em.IR.KfloatTeff[4048/5198] Effective temperatureKphys.temperature.effectiveintlogg[0.68/2.73] log surface gravitylog(cm.s**-2)phys.gravityfloatS3839[-0.4/0.21] S(3839) index; see equation 1meta.code.multipfloatDeltaCN[-0.13/0.46] {delta}CN index; see Section 3.1.3meta.code.multipfloatCH[0.13/0.47] CH index; see equation 2meta.code;spect.indexfloat[C/Fe][-0.8/0.5] log C/Fe abundance ratiophys.abund;arith.ratiofloat[N/Fe][0.79/1.8] log N/Fe abundance ratiophys.abund;arith.ratiofloat[O/Fe][-0.2/0.4]? log O/Fe abundance ratio (3)phys.abund;arith.ratiofloatnullable[Na/Fe][0.1/0.7]? log Na/Fe abundance ratio (3)phys.abund;arith.ratiofloatnullableBranchBranch locationmeta.code.classchar