J/MNRAS/485/4375ivo://CDS.VizieR/J/MNRAS/485/4375CDSDopcke G.Porto de Mello G.F.Sneden C.2023-10-10T14:29:46Z2023-10-10T15:28:58ZCDS support team

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

cds-question@unistra.frchemical-abundanceseffective-temperaturevisible-astronomyspectroscopystellar-agesinfrared-photometryWide-band photometrymedium-band-photometryStars in kinematic groups are believed to share the same age, metallicity, and velocity vectors, and are disrupted by events such as encounters with massive objects, leaving a residue of stars sharing the same kinematic properties, thus bridging an important evolutionary gap between clusters and field stars. We determine the most likely metallicity for the unevolved stars of the group, collectively, by assuming that these stars all conform to a single zero-age main sequence line and requiring that residual T_eff_ and luminosity values be minimized: the [Fe/H] value that best describes the observed HR diagram of the group lies in the range +0.05<[Fe/H]<+0.10. In this work, we report the detailed spectroscopic analysis of 23 stars in the Ursa Major Group (UMaG), together with seven young field stars that function as a control sample, based on high S/N, R~60000 optical spectra. We present abundances for C, Na, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Co, Fe, Ni, Cu, Zn, Sr, Y, Zr, Ba, La, Ce, Nd, Sm, Gd, and Eu. We also found that there is a clear kinematic nucleus in the UVW space, but from the spectroscopic analysis only a fraction of these stars could be considered chemically and chronologically homogeneous. The results suggest that the UMaG has physical existence in a chronochemokinematic sense, but is not chemically peculiar: high Ba abundance seems to be a common feature of young stars. From the initial sample, only 14 (61 per cent) stars were finally considered members of the UMaG, resulting in an average metallicity and standard deviation of [Fe/H]=0.01 and 0.07, respectively, consistent with previous works. We finally conclude that even though the UMaG stars share a common kinematics, age, and metallicity, they do not have the same chemical abundance pattern, pointing to a dynamical origin of the Group.2019MNRAS.485.4375Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/485/4375CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/485/4375https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/485/4375http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/485/4375https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/485/4375https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/485/4375http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/485/4375GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/485/4375/table1 (Group membership classification according to the results from King et al. (2003AJ....125.1980K))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/485/4375/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/485/4375/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/485/4375/table1?GETtext/xml+votable180.050000true27.3472869-10.70363440.0055555555555555566/1875 2520 4184 5088 5154 5413 7390 7763 8790 11075 11128 11145 11163 11165 11200 11225 17486 17907 20547 21060 21568 23230 23342 23661 23774 23960 24028 24151 24160 26521 27581 36664 39994 40408https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/485/4375?format=asciiOpticalInfrareddefaultJ/MNRAS/485/4375/table1Group membership classification according to the results from King et al. (2003AJ....125.1980K)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (HD NNNNNN)meta.id;meta.maincharMemberLikelihood of belonging to the group according to the results from King et al. (2003AJ....125.1980K) (1)stat.likelihoodcharB-VB-V colour index (2)magphot.color;em.opt.B;em.opt.Vfloatb-y? b-y coulour indexmagphot.color;em.opt.B;em.opt.Vfloatnullabler_b-yReferences for b-y (3)meta.ref;phot.color;em.opt.BcharBT-VT? BT-VT colour index (2)magphot.color;em.opt.B;em.opt.VfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_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/485/4375/table2Luminosities, Teff, and parallaxes used for the photometric analysisrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (HD NNNNNN)meta.id;meta.maincharTeffEffective temperature (1)Kphys.temperature.effectiveinte_TeffError on TeffKstat.error;phys.temperature.effectiveintlogLlog of stellar luminosity (2)log(solLum)phys.luminosityfloate_logLError on logL (3)log(solLum)stat.errorfloatplxParallaxmaspos.parallaxfloate_plxError on plxmasstat.error;pos.parallaxfloatJ/MNRAS/485/4375/table3Atmospheric parameters for the sampleTeffspSpectral effective temperatureKphys.temperature.effectiveintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (HD NNNNNNA)meta.id;meta.maincharn_NameNote on Name (1)meta.notecharS/NMean signal to noise ratiostat.snr;stat.meanintTeffphPhotomeric effective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloatvtMicroturbulent velocitykm/sphys.velocfloat[Fe/H]Iron to hydrogen abundance ratiophys.abund.Fe;arith.ratiofloatsigFeIDispersion on the abundance values obtained from the FeI linephys.dispMeasurefloatsigFeIIDispersion on the abundance values obtained from the FeII linephys.dispMeasurefloatnlFeINumber of FeI lines used to obtain all parametersmeta.numberintnlFeIINumber of FeII lines used to obtain all parametersmeta.numberintFWHMMean full width at half-maximum of the spectra0.1nmspect.line.width;stat.meanfloatJ/MNRAS/485/4375/table5Space Galactic Velocities (U, V, W) and radial velocity (RV) for the samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (HD NNNNNN)meta.id;meta.maincharUU component of space galactic velocitykm/sphys.veloc;pos.cartesian.xfloate_UError on Ukm/sstat.error;pos.cartesian.xfloatVV component of space galactic velocitykm/sphys.veloc;pos.cartesian.yfloate_VError on Vkm/sstat.error;pos.cartesian.yfloatWW component of space galactic velocitykm/sphys.veloc;pos.cartesian.zfloate_WError on Wkm/sstat.error;pos.cartesian.zfloatRVRadial velocitykm/sphys.veloc;pos.heliocentricfloate_RVError on RVkm/sstat.errorfloatNotesSource of the coordinates and proper motions used to compute the velocities (1)meta.notecharJ/MNRAS/485/4375/table6The kinematic nucleus of the UMaGrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (HD NNNNNN)meta.id;meta.mainchar[Fe/H]Iron to hydrogen abundance ratiophys.abund.Fe;arith.ratiofloatSM93Star abundance membership according to Soderblom & Mayor (1993AJ....105..226S)meta.code.membercharKKinStar abundance membership from King kinematics membership (King et al. 2003AJ....125.1980K) (1)meta.code.membercharKSpecStar abundance membership from King spectroscopic membership (King et al. 2003AJ....125.1980K) (1)meta.code.membercharKFinalStar abundance membership from King Final membership (King et al. 2003AJ....125.1980K) (1)meta.code.membercharJ/MNRAS/485/4375/table7Results of the evolutionary and nucleosynthetic analysesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (HD NNNNNN)meta.id;meta.mainchar[Fe/H]Iron to hydrogen abundance ratiophys.abund.Fe;arith.ratiofloatf_[Fe/H]Flag on [Fe/H] (1)meta.codecharkgroupk-group from the k-means analysis (G1)stat.fit.paramintAgeStar age (G2)time.agecharlogRHKLogarithm of R'_HK_ chromospheric activity index (G3)phot.flux;arith.ratiocharr_logRHKReferences for logRHK (2)meta.ref;pos.frameintJ/MNRAS/485/4375/table8Final nucleus for the UMaG with chronological, chemical, and kinematic identityVV component of space galactic velocitykm/sphys.veloc;pos.cartesian.yfloate_VError on Vkm/sstat.error;pos.cartesian.yfloat[Fe/H]Iron to hydrogen abundance ratiophys.abund.Fe;arith.ratiofloatkgroupk-group from the k-means analysis (G1)stat.fit.paramintAgeStar age (G2)time.agecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (HD NNNNNN)meta.id;meta.maincharUU component of space galactic velocitykm/sphys.veloc;pos.cartesian.xfloate_UError on Ukm/sstat.error;pos.cartesian.xfloatlogRHKLogarithm of R'_HK_ chromospheric activity index (G3)phot.flux;arith.ratiocharJ/MNRAS/485/4375/table9Comparison of stellar parameterrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (HD NNNNNNA)meta.id;meta.maincharTEffective temperature (this work)Kphys.temperature.effectiveintTAG? Effective temperature from Ammler-von Eiff & Guenther (2009A&A...508..677A)Kphys.temperature.effectiveintnullableTB? Effective temperature from Biazzo et al. (2012MNRAS.427.2905B)Kphys.temperature.effectiveintnullableTT? Effective temperature from Tabernero et al. (2017A&A...597A..33T)Kphys.temperature.effectiveintnullableloggSurface gravity (this work)log(cm.s**-2)phys.gravityfloatloggAG? Surface gravity from Ammler-von Eiff & Guenther (2009A&A...508..677A)log(cm.s**-2)phys.gravityfloatnullableloggB? Surface gravity from Biazzo et al. (2012MNRAS.427.2905B)log(cm.s**-2)phys.gravityfloatnullableloggT? Surface gravity from Tabernero et al. (2017A&A...597A..33T)log(cm.s**-2)phys.gravityfloatnullable[Fe/H]Iron to hydrogen abundance ratio (this work)phys.abund.Fe;arith.ratiofloat[Fe/H]AG? Iron to hydrogen abundance ratio from Ammler-von Eiff & Guenther (2009A&A...508..677A)phys.abund.Fe;arith.ratiofloatnullable[Fe/H]B? Iron to hydrogen abundance ratio from Biazzo et al. (2012MNRAS.427.2905B)phys.abund.Fe;arith.ratiofloatnullable[Fe/H]T? Iron to hydrogen abundance ratio from Tabernero et al. (2017A&A...597A..33T)phys.abund.Fe;arith.ratiofloatnullableJ/MNRAS/485/4375/table10Comparison of abundancesNameStar name (HD NNNNN)meta.id;meta.mainchar[Na/Fe]Na to iron abundance ratio (this work)phys.abundfloat[Al/Fe]BAl to iron abundance ratio from Biazzo et al. (2012MNRAS.427.2905B)phys.abundfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[Al/Fe]Al to iron abundance ratio (this work)phys.abundfloat[Ti/Fe]Ti to iron abundance ratio (this work)phys.abundfloat[Cr/Fe]Cr to iron abundance ratio (this work)phys.abundfloat[Ni/Fe]Ni to iron abundance ratio (this work)phys.abundfloat[Na/Fe]BNa to iron abundance ratio from Biazzo et al. (2012MNRAS.427.2905B)phys.abundfloat[Ti/Fe]BTi to iron abundance ratio from Biazzo et al. (2012MNRAS.427.2905B)phys.abundfloat[Cr/Fe]BCr to iron abundance ratio from Biazzo et al. (2012MNRAS.427.2905B)phys.abundfloat[Ni/Fe]BNi to iron abundance ratio from Biazzo et al. (2012MNRAS.427.2905B)phys.abundfloat[Na/Fe]TNa to iron abundance ratio from Tabernero et al. (2017A&A...597A..33T)phys.abundfloat[Al/Fe]TAl to iron abundance ratio from Tabernero et al. (2017A&A...597A..33T)phys.abundfloat[Ti/Fe]TTi to iron abundance ratio from Tabernero et al. (2017A&A...597A..33T)phys.abundfloat[Cr/Fe]TCr to iron abundance ratio from Tabernero et al. (2017A&A...597A..33T)phys.abundfloat[Ni/Fe]TNi to iron abundance ratio from Tabernero et al. (2017A&A...597A..33T)phys.abundfloat