J/MNRAS/514/4816ivo://CDS.VizieR/J/MNRAS/514/4816doi:10.26093/cds/vizier.75144816CDSKatime Santrich O.J.Kerber L.Abuchaim Y.Goncalves G.2025-10-10T20:12:13Z2025-06-06T13:49:33ZCDS support team

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

cds-question@unistra.frmilky-way-galaxygiant-starsopen-star-clustersspectroscopyphotometryvisible-astronomychemical-abundanceseffective-temperatureThe abundance ratios [Y/Mg], [Y/Al], [Y/Si], [Y/Ca], and [Y/Ti] have been suggested as chemical clocks for solar-metallicity dwarf stars in the field as well as for giant stars in open clusters. To verify this last hypothesis, we derive these abundances ratios of 50 giant stars belonging to seven open clusters. To calculate the abundances, we analyse FEROS spectra assuming the LTE-hypothesis. We confirm that [Y/Mg], [Y/Al], [Y/Si], [Y/Ca], and [Y/Ti] work as chemical clocks for field dwarf stars at the local region (d < 1 kpc) whereas for the field giants the [Y/Mg], [Y/Al], and [Y/Si] also present trends with the ages but high scattering. [Y/Ca] and [Y/Ti] do not present any correlation with ages in the field giants. In our open clusters, the behaviour is similar, [Y/Mg], [Y/Al], and [Y/Si] present evident trends, whereas [Y/Ca] versus ages is a flat and [Y/Ti] versus ages is less steep. We also confirm that the chemical clocks have high scatter at the early ages. In the case of the compiled sample, the chemical clocks are similar to our results but in some situations there are important differences. Several relations between abundance ratios and ages may be obtained when dwarfs and giants are analysed, confirming the non-universality of the spectroscopic age indicators.2022MNRAS.514.4816Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/514/4816CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)J/A+A/618/A93 : Gaia DR2 open clusters in the Milky WayJ/A+A/562/A71 : Chemical abundances of solar neighbourhood dwarfsJ/A+A/624/A78 : Masses and ages of 1059 HARPS-GTO stars (Delgado Mena+,2019)J/A+A/631/A171 : Neutron-capture elements in dwarf galaxiesJ/A+A/623/A108 : Age of 269 GDR2 open clusters (Bossini+, 2019)J/A+A/433/185 : Detailed abundance analysis of 102 F and G dwarfsJ/A+A/639/A127 : Age-chemical-clocks-metallicity relations (Casali+, 2020)J/A+A/652/A25 : Abundance-age relations with open clustersJ/A+A/616/A10 : 46 open clusters GaiaDR2 HR diagramsJ/AJ/150/88 : Abundances in the local region. I. G and K giantsJ/AJ/155/111 : Abundances in the local region. III. Southern dwarfsJ/AJ/136/375 : Chemical composition of LMC red giants (Mucciarelli+, 2008)J/ApJ/854/184 : Abundances of stars in 3 open clusters (Pena Suarez+, 2018)J/MNRAS/474/2580 : Temporal evolution of neutron-capture elementsJ/MNRAS/419/1350 : Red giants abundances in 4 open clusters (Reddy+, 2012)J/MNRAS/431/3338 : Abundances of red giants in open clusters (Reddy+, 2013)J/MNRAS/450/4301 : Line list for red giants in open clusters (Reddy+, 2015)J/MNRAS/485/3623 : Red giants abundance analysis in open clustershttps://doi.eso.org/10.18727/archive/24 : FEROS reduced spectrahttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/514/4816https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/514/4816http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/514/4816https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/514/4816https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/514/4816http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/514/4816GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/514/4816/cluster (Open cluster in our sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/514/4816/cluster?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/514/4816/cluster?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/514/4816/cluster?GETtext/xml+votable180.050000true261.212-49.9170.005555555555555556Cone search capability for table J/MNRAS/514/4816/table2 (Positional and photometric informations of the giant stars in the seven open clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/514/4816/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/514/4816/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/514/4816/table2?GETtext/xml+votable180.050000true208.3903333-61.83850560.0055555555555555566/4298 13195 13198 30438-30439 30444-30445 31812 31814 41688 41834 42274https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/514/4816?format=asciiOpticaldefaultJ/MNRAS/514/4816/clusterOpen cluster in our samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterOpen cluster name (Cluster)meta.id.parentcharSimbadSimbad column added by the CDSmeta.ref.urlcharNbrNumber of star in the cluster (Nbr)meta.numberint_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/514/4816/table2Positional and photometric informations of the giant stars in the seven open clustersSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar identification name as ClusterName-NNNNN (Star)meta.id;meta.maincharGaiaDR2Gaia DR2 identification source (GaiaDR2-ID)meta.id.assocRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVmagApparent AB magnitude in the optical V-band (V)magphot.mag;em.opt.VfloatB-VB-V optical colour index (B-V)magphot.color;em.opt.B;em.opt.VfloatJ/MNRAS/514/4816/table5Stellar atmospheric parameters calculated from our spectroscopic analysis workrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar identification name as ClusterName-NNNNN (Star)meta.id;meta.maincharTeffMean effective temperature derived from SAP spectroscopic analysis (Teff) (1)Kphys.temperature.effective;stat.meaninte_TeffStandard deviation/error of the Teff derived from SAP spectroscopic analysis ({sigma}Teff)Kstat.error;phys.temperature.effectiveintloggLogarithm of the surface gravity derived from SAP spectroscopic analysis (logg) (2)log(cm.s**-2)phys.gravityfloate_loggStandard deviation/error of the logg ({sigma}logg)log(cm.s**-2)stat.errorfloatvtMicroturbulence velocity derived from SAP spectroscopic analysis ({Xi}) (3)km/sphys.veloc.microTurbfloate_vtStandard deviation/error of the vt ({sigma}vt)km/sstat.errorfloat[Fe/H]Iron to hydrogen abundance ratio ([Fe/H]) (4)log(Sun)phys.abund.Fe;arith.ratiofloate_[Fe/H]Standard deviation/error of the [Fe/H] ({sigma}[Fe/H])log(Sun)stat.error;phys.abund.FefloatNFeIThe number of Fe I lines used in the spectroscopic analysis (#1)meta.number;spect.lineintNFeIIThe number of Fe II lines used in the spectroscopic analysis (#2)meta.number;spect.lineintJ/MNRAS/514/4816/table6*Abundance ratios [X/Fe] for the elements calculated from our spectroscopic analysis and EWs measurements work[Y/Fe]Yttrium to iron abundance ratio ([Y/Fe]) (7)log(Sun)phys.abund;arith.ratiofloat[Zr/Fe]Zirconium to iron abundance ratio ([Zr/Fe]) (8)log(Sun)phys.abundfloat[Ba/Fe]Barium to iron abundance ratio ([Ba/Fe]) (9)log(Sun)phys.abundfloat[La/Fe]Lanthanum to iron abundance ratio ([La/Fe]) (10)log(Sun)phys.abundfloat[Ce/Fe]Cerium to iron abundance ratio ([Ce/Fe]) (11)log(Sun)phys.abundfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar identification name as ClusterName-NNNNN (Star)meta.id;meta.mainchar[Mg/Fe]Magnesium to iron abundance ratio ([Mg/Fe]) (1)log(Sun)phys.abund;arith.ratiofloat[Al/Fe]Aluminium to iron abundance ratio ([Al/Fe]) (2)log(Sun)phys.abundfloat[Si/Fe]Silicium to iron abundance ratio ([Si/Fe]) (3)log(Sun)phys.abund;arith.ratiofloat[Ca/Fe]Calcium to iron abundance ratio ([Ca/Fe]) (4)log(Sun)phys.abund;arith.ratiofloat[Ti/Fe]Titanium to iron abundance ratio ([Ti/Fe]) (5)log(Sun)phys.abund;arith.ratiofloat[Sr/Fe]Strontium to iron abundance ratio ([Sr/Fe]) (6)log(Sun)phys.abund;arith.ratiofloat[Nd/Fe]Neodymium to iron abundance ratio ([Nd/Fe]) (12)log(Sun)phys.abundfloat[Eu/Fe]? Europium to iron abundance ratio ([Eu/Fe]) (13)log(Sun)phys.abundfloatnullableJ/MNRAS/514/4816/table7*Abundance ratios for Mg, Al, Si, Ca, Ti, Sr, Ba, and Eu in the cluster IC4651recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar identification name as ClusterName-NNNNN (Star)meta.id;meta.mainchar[Mg/Fe]Magnesium to iron abundance ratio ([Mg/Fe]) (1)log(Sun)phys.abund;arith.ratiofloat[Al/Fe]Aluminium to iron abundance ratio ([Al/Fe]) (2)log(Sun)phys.abundfloat[Si/Fe]Silicium to iron abundance ratio ([Si/Fe]) (3)log(Sun)phys.abund;arith.ratiofloat[Ca/Fe]Calcium to iron abundance ratio ([Ca/Fe]) (4)log(Sun)phys.abund;arith.ratiofloat[Ti/Fe]Titanium to iron abundance ratio ([Ti/Fe]) (5)log(Sun)phys.abund;arith.ratiofloat[Sr/Fe]Strontium to iron abundance ratio ([Sr/Fe]) (6)log(Sun)phys.abund;arith.ratiofloat[Ba/Fe]Barium to iron abundance ratio ([Ba/Fe]) (7)log(Sun)phys.abundfloat[Eu/Fe]Europium to iron abundance ratio ([Eu/Fe]) (8)log(Sun)phys.abundfloatJ/MNRAS/514/4816/table9*Chemical clocks in the seven open clusters samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar identification name as ClusterName-NNNNN (Star)meta.id;meta.mainchar[Y/Mg]Yttrium to Magnesium abundance ratio ([Y/Mg]) (1)phys.abundfloat[Y/Al]Yttrium to Aluminium abundance ratio ([Y/Al]) (2)phys.abundfloat[Y/Si]Yttrium to Silicium abundance ratio ([Y/Si]) (3)phys.abundfloat[Y/Ca]Yttrium to Calcium abundance ratio ([Y/Ca]) (4)phys.abundfloat[Y/Ti]Yttrium to Titanium abundance ratio ([Y/Ti]) (5)phys.abundfloat