J/ApJ/742/37ivo://CDS.VizieR/J/ApJ/742/37doi:10.26093/cds/vizier.17420037CDSRoederer I.U.Marino A.F.Sneden C.2017-11-29T11:48:31Z2013-04-29T12:24:34ZCDS support team

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

cds-question@unistra.frglobular-star-clusterschemical-abundancesgiant-starsradial-velocityWe present an empirical s-process abundance distribution derived with explicit knowledge of the r-process component in the low-metallicity globular cluster M22. We have obtained high-resolution, high signal-to-noise spectra for six red giants in M22 using the Magellan Inamori Kyocera Echelle spectrograph on the Magellan-Clay Telescope at Las Campanas Observatory. In each star we derive abundances for 44 species of 40 elements, including 24 elements heavier than zinc (Z=30) produced by neutron-capture reactions. Previous studies determined that three of these stars (the "r+s group") have an enhancement of s-process material relative to the other three stars (the "r-only group"). We confirm that the r+s group is moderately enriched in Pb relative to the r-only group. Both groups of stars were born with the same amount of r-process material, but s-process material was also present in the gas from which the r+s group formed. The s-process abundances are inconsistent with predictions for asymptotic giant branch (AGB) stars with M<=3M_{sun}_ and suggest an origin in more massive AGB stars capable of activating the ^22^Ne({alpha},n)^25^Mg reaction. We calculate the s-process "residual" by subtracting the r-process pattern in the r-only group from the abundances in the r+s group. In contrast to previous r- and s-process decompositions, this approach makes no assumptions about the r- and s-process distributions in the solar system and provides a unique opportunity to explore s-process yields in a metal-poor environment.2011ApJ...742...37Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/742/37CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/541/A15 : Abundances of M22 subgiants (Marino+, 2012)J/AcA/62/357 : Proper motions of 6 globular clusters (Zloczewski+, 2012)J/ApJ/705/1481 : Spectroscopy of stars in 6 GCs (Da Costa+, 2009)J/MNRAS/349/1278 : BVI photometry of M22 (Monaco+, 2004)J/A+A/373/899 : New variables in M22 globular cluster (Kaluzny+, 2001)J/PASP/107/32 : uvby-hk photometry in M22 (Anthony-Twarog+ 1995)J/ApJS/99/637 : Equivalent widths for 54 red giants (Norris+ 1995)J/A+AS/109/487 : Color-magnitude study of M 22 (Samus+, 1995)J/A+A/303/468 : Spec. & IR-phot. in globular clusters (Minniti, 1995)J/ApJ/420/612 : Proper motions + radial velocities in M22 (Peterson+ 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/742/37https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/742/37http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/742/37https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/742/37https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/742/37http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/742/37GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/742/37/table1 (Photometry, atmospheric parameters, radial velocities, exposure times, and S/N estimates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/742/37/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/742/37/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/742/37/table1?GETtext/xml+votable180.050000true279.1274583-23.880250.0055555555555555566/28972 289733.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/742/37?format=asciiOpticaldefaultJ/ApJ/742/37/table2Line-by-line abundancesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonSpecies identificationphys.abundcharlambdaWavelength0.1nmem.wlfloatExPotExcitation PotentialeVphys.atmol.excitationfloatlog(gf)log of the oscillator strengthphys.atmol.oscStrengthfloatr_log(gf)Reference for log(gf) (see refs.dat file)meta.ref;pos.frameintl_I-37Limit flag on I-37meta.code.errorcharI-37? abundance for star I-37 (log{epsilon})phys.abundfloatnullableu_I-37Uncertainty flag on I-37 of order 0.2dexmeta.code.errorcharl_III-33Limit flag on III-33meta.code.errorcharIII-33? abundance for star III-33 (log{epsilon})phys.abundfloatnullableu_III-33Uncertainty flag on III-33 of order 0.2dexmeta.code.errorcharl_IV-59Limit flag on I-59meta.code.errorcharIV-59? abundance for star IV-59 (log{epsilon})phys.abundfloatnullableu_IV-59Uncertainty flag on IV-59 of order 0.2dexmeta.code.errorcharl_I-27Limit flag on I-27meta.code.errorcharI-27? abundance for star I-27 (log{epsilon})phys.abundfloatnullableu_I-27Uncertainty flag on I-27 of order 0.2dexmeta.code.errorcharl_I-53Limit flag on I-53meta.code.errorcharI-53? abundance for star I-53 (log{epsilon})phys.abundfloatnullableu_I-53Uncertainty flag on I-53 of order 0.2dexmeta.code.errorcharl_I-80Limit flag on I-80meta.code.errorcharI-80? abundance for star I-80 (log{epsilon})phys.abundfloatnullableu_I-80Uncertainty flag on I-80 of order 0.2dexmeta.code.errorcharJ/ApJ/742/37/refsReferences for log(gf)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.noteintBibCodeBibcodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharCommCommentmeta.notecharJ/ApJ/742/37/table1Photometry, atmospheric parameters, radial velocities, exposure times, and S/N estimatesSimbadNameSimbad column added by the CDSmeta.idcharVtTurbulent velocitykm/sphys.veloc.microTurbfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (1)meta.id;meta.maincharVmagV-band magnitude (2)magphot.mag;em.opt.Vfloat(B-V)0B-V color index (2)magphot.color;em.opt.B;em.opt.VfloatTeffEffective temperature from Marino et al. 2011A&A...532A...8MKphys.temperature.effectiveintloggSurface gravity from Marino et al. 2011A&A...532A...8Mlog(cm.s**-2)phys.gravityfloat[Fe/H]Metallicityphys.abund.ZfloatHRVHeliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatTexpExposure timestime.duration;obs.exposureintS/N3[40/50] 395nm signal to noise ratiostat.snrintS/N4[90/125] 455nm signal to noise ratiostat.snrintS/N5[95/140] 520nm signal to noise ratiostat.snrintS/N6[210/340] 675nm signal to noise ratiostat.snrintASimbad column added by the CDSmeta.ref.urlchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.main