J/ApJ/860/49ivo://CDS.VizieR/J/ApJ/860/49doi:10.26093/cds/vizier.18600049CDSMatsuno T.Yong D.Aoki W.Ishigaki M.N.2019-10-16T14:28:07Z2019-07-18T07:38:25ZCDS support team

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

cds-question@unistra.frvisible-astronomyspectroscopyradial-velocityline-intensitieschemical-abundancesWe report chemical abundances of 14 young {alpha}-rich stars including neutron-capture elements based on high-quality optical spectra from HIRES/Keck I and differential line-by-line analysis. From a comparison of the abundance patterns of young {alpha}-rich stars to those of nearby bright red giants with a similar metallicity range (-0.7<[Fe/H]{<}-0.2), we confirm their high {alpha}-element abundances reported by previous studies based on near-infrared spectroscopy. We reveal for the first time low abundances of s-process elements and high abundances of r-process elements. All the abundances are consistent with those seen in the typical {alpha}-rich population of the Galactic disk, and no abundance anomalies are found except for Li-enhancement in one object previously reported and mild enhancement of Na in two stars. In particular, the lack of s-process enhancement excludes the hypothesis that mass transfer from asymptotic giant branch stars plays an important role in the formation of young {alpha}-rich stars. The high frequency of radial velocity variation (more than 50%) is also confirmed. We argue that mass transfer from low-mass red giants is the likely dominant formation mechanism for young {alpha}-rich stars.2018ApJ...860...49Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/860/49CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/corot : CoRoT observation log (N2-4.4) (CoRoT 2016)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/ApJ/645/613 : Abundances of HD 221170 (Ivans+, 2006)J/ApJ/667/1267 : CrI transition probabilities (Sobeck+, 2007)J/ApJS/182/51 : Transition prob. of rare earth elements (Lawler+, 2009)J/ApJS/194/35 : Atomic transition probabilities of Mn (Den Hartog+, 2011)J/ApJS/208/27 : Sun and HD 84937 TiII log(gf) and abundances (Wood+, 2013)J/A+A/562/A71 : Abundances of solar neighbourhood dwarfs (Bensby+, 2014)J/ApJS/215/20 : Vanadium log(gf) & transition probabilities (Lawler+, 2014)J/MNRAS/441/3127 : FeI oscillator strengths for Gaia-ESO (Ruffoni+, 2014)J/ApJS/211/20 : NiI transition probability measurements (Wood+, 2014)J/ApJS/220/13 : Co I transition probabilities (Lawler+, 2015)J/A+A/586/A49 : r- & s- process elements in the MW disk (Battistini+, 2016)J/ApJ/817/40 : High-res. NIR spectra of local giants (Feuillet+, 2016)J/A+A/594/A43 : APOGEE/Kepler sample stars abundances (Hawkins+, 2016)J/ApJS/228/10 : Transition prob. for 183 lines of Cr II (Lawler+, 2017)J/MNRAS/474/2580 : Temporal evolution of neutron-capture elementshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/860/49https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/860/49http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/860/49https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/860/49https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/860/49http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/860/49GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/860/49/stars (Observation log and derived parameters of the (tables 1 and 3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/860/49/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/860/49/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/860/49/stars?GETtext/xml+votable180.050000true292.046375-0.33344440.0055555555555555566/595 1577 2664 2728 3023 3975 12655 13369 13962 14174 14581 14918 14923 14924 14947 14967 15137 15140 15143 15149 15172 15457 17783 17959 18888 20250 23526 30122 30293 30464https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/860/49?format=asciiOpticaldefaultJ/ApJ/860/49/starsObservation log and derived parameters of the (tables 1 and 3)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSet[1/2] Subset (1=Young {alpha}-rich stars or 2=Comparison stars)meta.codeintNameObject name used in this study (1)meta.idcharprimary2MASS2MASS identifier (JHHMMSSss+DDMMSSs)meta.id;meta.maincharExp[20/9000] Exposure timestime.duration;obs.exposureintSNR[145/440] Spectral signal-to-noise ratio at 6000{AA} per pixel (2)stat.snrintMass[0.6/2.7] Derived Mass (3)solMassphys.massfloate_Mass[0.1/0.8] Uncertainty in Mass (3)solMassstat.error;phys.massfloatRV1[-86.6/69.1] Radial velocity derived in this studykm/sspect.dopplerVelocfloatRV2[-85.8/71.8] Previous APOGEE radial velocitykm/sspect.dopplerVelocfloatf_Namea= Reference star = KIC11445818meta.codecharTeff[4440/4902] Derived effective temperatureKphys.temperature.effectiveinte_Teff[16/55]? Uncertainty in TeffKstat.error;phys.temperature.effectiveintnullablelogg[1.7/3.3] Derived surface gravitylog(cm.s**-2)phys.gravityfloate_logg[0.06/0.2]? Uncertainty in logglog(cm.s**-2)stat.errorfloatnullablevt[1.5/2] Turbulent velocitykm/sphys.velocfloate_vt[0.03/0.07]? Uncertainty in vtkm/sstat.errorfloatnullableEWNumber of equivalent width measurements for this star (link to Table 2)meta.numberintnullableADisplay the abundance measurements for this star (link to Table 4)meta.ref.urlcharF16Display the data from Feuillet+ 2016, J/ApJ/817/40meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from 2MASS names (right ascension part)degpos.eq.ra;meta.main_DEPositions from 2MASS names (declination part)degpos.eq.dec;meta.mainJ/ApJ/860/49/table2Line list, equivalent widths and FWHMrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject name used in this study (as in Table 1)meta.id;instr.setupcharSpSpeciesphys.atmol.ionStagecharlambda[5211.5/8717.9] Wavelength0.1nmem.wldoubleExPot[0/6.3] Excitation PotentialeVphys.atmol.excitationfloatlog(gf)[-6/0.7] Log of oscillator strengthphys.atmol.oscStrengthfloatEW[2.2/432.7] Equivalent Width, m{AA}0.1pmspect.line.eqWidthfloatFWHM[0.09/0.4] FWHM, Angstroms0.1nmspect.line.widthfloatRef[1/34] References (1)meta.refintJ/ApJ/860/49/table4AbundancesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject name used in this study (as in Table 1)meta.id;instr.setupcharSpSpeciesphys.atmol.ionStagechar[X/H][-0.7/0.5] Abundance of species relative to Hphys.abund;arith.ratiofloate_[X/H][0.02/0.2]? Uncertainty in [X/H]stat.error;phys.abundfloatnullable[X/Fe][-0.2/1.1]? Abundance of species relative to Fephys.abundfloatnullablee_[X/Fe][0.01/0.2]? Uncertainty in [X/Fe]stat.error;phys.abundfloatnullable