J/ApJ/836/168ivo://CDS.VizieR/J/ApJ/836/168doi:10.26093/cds/vizier.18360168CDSJohnson C.I.Caldwell N.Rich R.M.Mateo M.Bailey III J.I.,Clarkson W.I.Olszewski E.W.Walker M.G.2018-01-11T09:45:21Z2017-10-25T13:35:02ZCDS support team

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

cds-question@unistra.frglobular-star-clusterschemical-abundancesgiant-starsradial-velocityline-intensitiesinfrared-photometryRecent observations have shown that a growing number of the most massive Galactic globular clusters contain multiple populations of stars with different [Fe/H] and neutron-capture element abundances. NGC 6273 has only recently been recognized as a member of this "iron-complex" cluster class, and we provide here a chemical and kinematic analysis of >300 red giant branch and asymptotic giant branch member stars using high-resolution spectra obtained with the Magellan-M2FS and VLT-FLAMES instruments. Multiple lines of evidence indicate that NGC 6273 possesses an intrinsic metallicity spread that ranges from about [Fe/H]=-2 to -1 dex, and may include at least three populations with different [Fe/H] values. The three populations identified here contain separate first (Na/Al-poor) and second (Na/Al-rich) generation stars, but a Mg-Al anti-correlation may only be present in stars with [Fe/H]>~-1.65. The strong correlation between [La/Eu] and [Fe/H] suggests that the s-process must have dominated the heavy element enrichment at higher metallicities. A small group of stars with low [{alpha}/Fe] is identified and may have been accreted from a former surrounding field star population. The cluster's large abundance variations are coupled with a complex, extended, and multimodal blue horizontal branch (HB). The HB morphology and chemical abundances suggest that NGC 6273 may have an origin that is similar to {omega} Cen and M54.2017ApJ...836..168Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/836/168CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/eso : ESO Science Archive Catalog (ESO, 1991-2016)VII/195 : Globular Clusters in the Milky Way (Harris, 1996)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)V/150 : Updated catalog of variable stars in GCs (Clement+ 2017)J/AJ/112/545 : Proton capture chains in GCs. I. (Pilachowski+ 1996)J/PASP/109/883 : Globular metallicity scale. I. (Rutledge+ 1997)J/A+A/391/945 : HST photometry of 74 galactic GCs (Piotto+, 2002)J/AJ/130/2140 : Abundances & velocities in globular clusters (Pritzl+, 2005)J/AJ/134/1298 : CaII equivalent widths in 29 GCs (Carrera+, 2007)J/AJ/133/1287 : JHK photom. of 24 Galactic globular clusters (Valenti+, 2007)J/MNRAS/383/183 : CaII triplet of RGB from VLT/FLAMES obs. (Battaglia+, 2008)J/A+A/486/177 : Bulge field stars from FLAMES-GIRAFFE sp. (Zoccali+, 2008)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/705/1481 : Spectrosc. of stars in 6 globular clusters (Da Costa+, 2009)J/MNRAS/404/1529 : s-process in low-metallicity stars (Bisterzo+, 2010)J/AJ/143/70 : Differential reddening in MW globulars (Alonso-Garcia+, 2012)J/A+A/540/A27 : Spectroscopy in Galactic globular clusters (Saviane+, 2012)J/A+A/549/A147 : Microlensed bulge dwarf star abundances. V. (Bensby+, 2013)J/other/Nat/498.198 : Na abundances in NGC6752 (Campbell+, 2013)J/MNRAS/434/1681 : Extremely metal-poor stars CaII triplet (Carrera+, 2013)J/ApJ/769/40 : Potassium abundance in red giants of GCs (Carretta+, 2013)J/ApJ/765/157 : Red giant abundances in the Galactic bulge (Johnson+, 2013)J/A+A/563/A76 : CaII triplet equivalent widths in 30 globulars (Mauro+, 2014)J/A+A/562/A66 : GIRAFFE Inner Bulge Survey (GIBS). I. (Zoccali+, 2014)J/AJ/149/53 : RVs of 12 Milky Way globular clusters (Kimmig+, 2015)J/A+A/573/A115 : Radial velocities in seven globular clusters (Lardo+, 2015)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/AJ/149/153 : Abundances of red giants in 10 GCs (Meszaros+, 2015)J/A+A/580/A121 : CaT/[Fe/H] for Galactic bulge stars (Vasquez+, 2015)J/MNRAS/455/199 : CaII triplet in red giant spectra (Da Costa, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/836/168https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/836/168http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/836/168https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/836/168https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/836/168http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/836/168GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/836/168/table3 (Star identifiers, coordinates, photometry, and radial velocities for non-members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/836/168/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/836/168/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/836/168/table3?GETtext/xml+votable180.050000true255.50269611-26.1966250.005555555555555556Cone search capability for table J/ApJ/836/168/table2 (Star identifiers, coordinates, photometry, and radial velocities for NGC 6273 members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/836/168/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/836/168/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/836/168/table2?GETtext/xml+votable180.050000true255.59280111-26.228718060.0055555555555555566/29216 292188.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/836/168?format=asciiOpticalInfrareddefaultJ/ApJ/836/168/table3Star identifiers, coordinates, photometry, and radial velocities for non-membersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSetSample (G1)src.sampleint2MASS2MASS identifier (HHMMSSss+DDMMSSs; J2000)meta.id;meta.maincharf_2MASSObservation notes (G2)meta.codecharRAJ2000Right Ascension, decimal degrees (J2000) (1)degpos.eq.ra;meta.mainDEJ2000Declination, decimal degrees (J2000) (1)degpos.eq.dec;meta.mainJmag[10.3/16.2] 2MASS J magnitude (1)magphot.mag;em.IR.JfloatKsmag[9.3/16.5] 2MASS Ks magnitude (1)magphot.mag;em.IR.KfloatHRV[-351/347] Heliocentric radial velocity (range between ~120-165km/s for the members)km/sspect.dopplerVeloc;pos.heliocentricfloate_HRV[0.1/6] Uncertainty in HRVkm/sstat.errorfloatJ/ApJ/836/168/table1Observing logrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsObservation (P=Photometry; S=Spectroscopy)meta.codecharFieldField (1)meta.id;obs.fieldcharTelTelescope/Instrumentmeta.notecharSetupInstrument setupinstr.setupcharDateUT Date of Observationtime.epoch;obsnullableExpExposure sequence(s)stime.expocharJ/ApJ/836/168/abundModel atmosphere parameters and chemical abundances Na-Eu for NGC 6273 members (tables 4-6)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS identifier (HHMMSSss+DDMMSSs; J2000)meta.id;meta.maincharn_2MASS[abd] Observation notes (G2)meta.notecharTeff[4200/4900]? Effective temperatureKphys.temperature.effectiveintnullablelog(g)[0.2/2.4]? Surface gravitycm.s**-2phys.gravityfloatnullable[Fe/H][-2/-1]? Metallicitylog(Sun)phys.abund.Zfloatnullablexi[1.3/2.3]? Microturbulent velocitykm/sphys.velocfloatnullablef_2MASS[a-c] Observation notes (G2)meta.codechar[NaI/Fe][-0.2/0.7]? [NaI/Fe] abundancephys.abundfloatnullablee_[NaI/Fe]? Uncertainty for [NaI/Fe]stat.error;phys.abundfloatnullable[MgI/Fe][0.2/0.6]? [MgI/Fe] abundancephys.abundfloatnullablee_[MgI/Fe]? Uncertainty for [MgI/Fe]stat.error;phys.abundfloatnullable[AlI/Fe][0.1/1.3]? [AlI/Fe] abundancephys.abundfloatnullablee_[AlI/Fe]? Uncertainty for [AlI/Fe]stat.error;phys.abundfloatnullable[SiI/Fe][-0.2/0.6]? [SiI/Fe] abundancephys.abundfloatnullablee_[SiI/Fe]? Uncertainty for [SiI/Fe]stat.error;phys.abundfloatnullable[CaI/Fe][-0.07/0.5]? [CaI/Fe] abundancephys.abundfloatnullablee_[CaI/Fe]? Uncertainty for [CaI/Fe]stat.error;phys.abundfloatnullable[CrI/Fe][-0.2/0.3]? [CrI/Fe] abundancephys.abundfloatnullablee_[CrI/Fe]? Uncertainty for [CrI/Fe]stat.error;phys.abundfloatnullable[FeI/H][-2.1/-1]? [FeI/H] abundancelog(Sun)phys.abundfloatnullablee_[FeI/H]? Uncertainty in [FeI/H]log(Sun)stat.error;phys.abundfloatnullable[FeII/H][-2/-1.1]? [FeII/H] abundancelog(Sun)phys.abundfloatnullablee_[FeII/H]? Uncertainty in [FeII/H]log(Sun)stat.error;phys.abundfloatnullable[NiI/Fe][-0.4/0.2]? [NiI/Fe] abundancelog(Sun)phys.abundfloatnullablee_[NiI/Fe]? Uncertainty in [NiI/Fe]log(Sun)stat.error;phys.abundfloatnullable[LaII/Fe][-0.4/1.2]? [LaII/Fe] abundancelog(Sun)phys.abundfloatnullablee_[LaII/Fe]? Uncertainty in [LaII/Fe]log(Sun)stat.error;phys.abundfloatnullable[EuII/Fe][0.1/0.8]? [EuII/Fe] abundancelog(Sun)phys.abundfloatnullablee_[EuII/Fe]? Uncertainty in [EuII/Fe]log(Sun)stat.error;phys.abundfloatnullableJ/ApJ/836/168/table2Star identifiers, coordinates, photometry, and radial velocities for NGC 6273 membersSetSample (G1)src.sampleintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCaTDisplay the Calcium triplet metallicity data (table 7) for this star if anymeta.ref.urlint2MASS2MASS identifier (HHMMSSss+DDMMSSs; J2000)meta.id;meta.maincharprimaryADisplay the chemical abundances (tables 4-6)meta.ref.urlcharf_2MASSObservation notes (G2)meta.codecharRAJ2000Right Ascension, decimal degrees (J2000) (1)degpos.eq.ra;meta.mainDEJ2000Declination, decimal degrees (J2000) (1)degpos.eq.dec;meta.mainJmag[10.3/16.2] 2MASS J magnitude (1)magphot.mag;em.IR.JfloatKsmag[9.3/16.5] 2MASS Ks magnitude (1)magphot.mag;em.IR.KfloatHRV[-351/347] Heliocentric radial velocity (range between ~120-165km/s for the members)km/sspect.dopplerVeloc;pos.heliocentricfloate_HRV[0.1/6] Uncertainty in HRVkm/sstat.errorfloatJ/ApJ/836/168/table7Calcium triplet metallicity datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSetSample (G1)src.sampleint2MASS2MASS identifier (HHMMSSss+DDMMSSs; J2000)meta.id;meta.maincharf_2MASSObservation notes (G2)meta.codecharW(8542)[1.5/4]? Equivalent width of CaII{lambda}85420.1nmspect.line.eqWidthfloatnullableW(8662)[1.2/3]? Equivalent width of CaII{lambda}86620.1nmspect.line.eqWidthfloatnullablesW[2.9/7]? Summed equivalent width0.1nmspect.line.eqWidthfloatnullablerW[2.6/6]? Reduced equivalent width0.1nmspect.line.eqWidthfloatnullable[Fe/H][-2.3/-0.5]? Metallicity values derived from Calcium Tripletlog(Sun)phys.abund.Zfloatnullablee_[Fe/H][0.1/0.6]? Uncertainty in [Fe/H]log(Sun)stat.error;phys.abund.Fefloatnullable