J/ApJ/832/99ivo://CDS.VizieR/J/ApJ/832/99doi:10.26093/cds/vizier.18320099CDSLim D.Lee Y.-W.Pasquato M.Han S.-I.Roh D.-G.2022-11-21T06:56:29Z2017-03-28T07:39:40ZCDS support team

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

cds-question@unistra.frglobular-star-clusterschemical-abundancesspectroscopyphotometryMost globular clusters (GCs) are now known to host multiple stellar populations with different abundances of light elements. Here we use narrow-band photometry and low-resolution spectroscopy for NGC 362 and NGC 6723 to investigate their chemical properties and radial distributions of subpopulations. We confirm that NGC 362 and NGC 6723 are among the GCs with multiple populations showing bimodal CN distribution and CN-CH anticorrelation without a significant spread in calcium abundance. These two GCs show more centrally concentrated CN-weak, earlier generation stars compared to the CN-strong, later generation stars. These trends are reversed with respect to those found in previous studies for many other GCs. Our findings, therefore, seem contradictory to the current scenario for the formation of multiple stellar populations, but mass segregation acting on the two subpopulations might be a possible solution to explain this reversed radial trend.2016ApJ...832...99Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/832/99CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/824/73 : Abundances of NGC 6362 member stars (Mucciarelli+, 2016)J/ApJS/219/7 : Ca,by photometry in globular clusters. I. M22 (Lee, 2015)J/ApJS/216/19 : Spectroscopic HK' index for 3 globular clusters (Lim+, 2015)J/ApJ/804/71 : HST/WFC3 observations of stars in M15 (Larsen+, 2015)J/MNRAS/449/4038 : Li abundance of giants in 3 GCs (D'Orazi+, 2015)J/A+A/573/A92 : Horizontal branch stars in NGC 6723 (Gratton+, 2015)J/A+A/557/A138 : Chemical abundances in the GlC NGC 362 (Carretta+ 2013)J/ApJ/754/L38 : Abundances & radial velocities of M13 giants (Johnson+, 2012)J/AJ/142/126 : CN & CH in SDSS Galactic globular clusters (Smolinski+, 2011)J/A+A/533/A69 : Spectroscopy of 124 RGB stars in NGC 1851 (Carretta+, 2011)J/A+A/524/A44 : CN and CH line strengths in 12 globulars (Pancino+, 2010)J/A+A/505/117 : Abundances of red giants in 15 GCs (Carretta+, 2009)J/A+A/490/625 : Abundances of NGC 6121 red giants (Marino+, 2008)J/A+A/486/437 : CN and CH line strengths in 8 Galactic GlCl (Kayser+, 2008)J/A+A/463/589 : Variables stars in NGC 362 (Szekely+, 2007)J/ApJ/643/680 : Imaging & spectroscopy around PKS 0405-123 (Prochaska+, 2006)J/AJ/125/197 : CN abundances of the 47 Tuc main sequence (Harbeck+, 2003)J/AJ/122/2569 : VI photometry of NGC 288, 362 and 1851 (Bellazzini+, 2001)J/AJ/106/1508 : Dynamics of globular cluster NGC 362 (Fischer+ 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/832/99https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/832/99http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/832/99https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/832/99https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/832/99http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/832/99GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/832/99/table2 (Index measurements for the stars in NGC 362 and NGC 6723)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/832/99/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/832/99/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/832/99/table2?GETtext/xml+votable180.050000true15.82759-70.898030.0055555555555555566/33330 47825 47828https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/832/99?format=asciidefaultJ/ApJ/832/99/table2Index measurements for the stars in NGC 362 and NGC 6723recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalGalaxy identifier (N362 or N6723)meta.id.parentcharID[1003/4162] Star identifier within Galmeta.id;meta.mainintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainymag[13.6/17.5] The CTIO y band magnitudemagphot.mag;em.opt.Vfloathk-Ca+CN[0.5/1.3] The hk_Ca+CN_ index (1)spect.indexfloatHK'[0.3/0.7] The HK' index (2)spect.indexfloate_HK'[0.01/0.06] Uncertainty in HK'stat.errorfloatdelHK'[-0.12/0.1] The delta HK' index (3)stat.fit.residualfloatCN[-0.5/0.5] The CN index (2)meta.code;spect.indexfloate_CN[0.01/0.2] Uncertainty in CNstat.errorfloatdelCN[-0.4/0.4] The delta CN index (3)stat.fit.residualfloatCH[0.9/1.3] The CH index (2)meta.code;spect.indexfloate_CH[0.008/0.04] Uncertainty in CHstat.errorfloatdelCH[-0.2/0.07] The delta CH index (3)stat.fit.residualfloatS07Display data from Szekely+, 2007, J/A+A/463/589, within 0.5"meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar