J/MNRAS/482/5302ivo://CDS.VizieR/J/MNRAS/482/5302doi:10.26093/cds/vizier.74825302CDSSimpson J.D.Martell S.L.Da Costa G.Casey A.R.Freeman K.C.,Horner J.Ting Y.-S.Nataf D.M.Lewis G.F.Ness M.K.Zucker D.B.,Cottrell P.L.Cotar K.Asplund M.Bland-Hawthorn J.Buder S.,D'Orazi V.De Silva G.M.Duong L.Kos J.Lin J.Lind K.,Schlesinger K.J.Sharma S.Zwitter T.Kafle P.R.Nordlander T.2024-09-02T20:15:38Z2023-06-12T13:37:54ZCDS support team

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

cds-question@unistra.frchemical-abundancesgalaxy-planesmilky-way-galaxyapparent-magnitudeWe present a study using the second data release of the GALAH survey of stellar parameters and elemental abundances of 15 pairs of stars identified by Oh et al. They identified these pairs as potentially co-moving pairs using proper motions and parallaxes from Gaia DR1. We find that 11 very wide (>1pc) pairs of stars do in fact have similar Galactic orbits, while a further four claimed co-moving pairs are not truly co-orbiting. Eight of the 11 co-orbiting pairs have reliable stellar parameters and abundances, and we find that three of those are quite similar in their abundance patterns, while five have significant [Fe/H] differences. For the latter, this indicates that they could be co-orbiting because of the general dynamical coldness of the thin disc, or perhaps resonances induced by the Galaxy, rather than a shared formation site. Stars such as these, wide binaries, debris of past star formation episodes, and coincidental co-orbiters, are crucial for exploring the limits of chemical tagging in the Milky Way.2019MNRAS.482.5302Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/482/5302CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/478/4513 : GALAH Survey DR2 (Buder+, 2018)J/AJ/153/257 : Comoving stars in Gaia DR1 (Oh+, 2017)I/345 : Gaia DR2 (Gaia Collaboration, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/482/5302https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/482/5302http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/482/5302https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/482/5302https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/482/5302http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/482/5302GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/482/5302/table1 (The stellar parameters and orbital characteristics of the 15 pairs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/482/5302/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/482/5302/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/482/5302/table1?GETtext/xml+votable180.050000true183.6420447-51.17014030.0055555555555555566/37769 38142 38162 38169 38480 38484-38485 41149 41192 41194 41261-41262 41320 41331 41348 41998 42646 42654 43129 43304 43528 43531-43533 47448-474491.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/482/5302?format=asciidefaultJ/MNRAS/482/5302/table1The stellar parameters and orbital characteristics of the 15 pairse_[Na/Fe]Error on [Na/Fe]stat.error;phys.abunddoublee_[Ca/Fe]Error on [Ca/Fe]stat.error;phys.abunddoublee_[K/Fe]Error on [K_Fe]stat.error;phys.abunddoublef_[K/Fe]Flag on [K_Fe] (2)meta.codeint[Ca/Fe]Calcuim to iron abundance ratiophys.abund.Fe;arith.ratiodoublef_[V/Fe]Flag on [V/Fe] (2)meta.codeint[Cr/Fe]Chromium to iron abundance ratiophys.abund.Fe;arith.ratiodoublee_[Cr/Fe]Error on [Cr/Fe]stat.error;phys.abunddoublef_[Cr/Fe]Flag on [Cr/Fe] (2)meta.codeinte_[Mn/Fe]Error on [Mn/Fe]stat.error;phys.abunddoublef_[Mn/Fe]Flag on [Mn/Fe] (2)meta.codeint[Co/Fe]Cobalt to iron abundance ratiophys.abunddoublee_[Co/Fe]Error on [Co/Fe]stat.error;phys.abunddoublef_[Co/Fe]Flag on [Co/Fe] (2)meta.codeint[Ni/Fe]Nickel to iron abundance ratiophys.abund.Fe;arith.ratiodoublee_[Ni/Fe]Error on [Ni/Fe]stat.error;phys.abunddoublef_[Ni/Fe]Flag on [Ni/Fe] (2)meta.codeint[Cu/Fe]Copper to iron abundance ratiophys.abunddoublee_[Cu/Fe]Error on [Cu/Fe]stat.error;phys.abunddoublef_[Cu/Fe]Flag on [Cu/Fe] (2)meta.codeint[Zn/Fe]Zinc to iron abundance ratiophys.abunddoublee_[Zn/Fe]Error on [Zn/Fe]stat.error;phys.abunddoublef_[Zn/Fe]Flag on [Zn/Fe] (2)meta.codeint[Y/Fe]Yttrium to iron abundance ratiophys.abund.Fe;arith.ratiodoublee_[Y/Fe]Error on [Y/Fe]stat.error;phys.abunddoublef_[Y/Fe]Flag on [Y/Fe] (2)meta.codeint[Ba/Fe]Barium to iron abundance ratiophys.abund.Fe;arith.ratiodoublee_[Ba/Fe]Error on [Ba/Fe]stat.error;phys.abunddoublef_[Ba/Fe]Flag on [Ba/Fe] (2)meta.codeint[La/Fe]Lanthanum to iron abundance ratiophys.abunddoublee_[La/Fe]Error on [La/Fe]stat.error;phys.abunddoublef_[La/Fe]Flag on [La/Fe] (2)meta.codeint[Eu/Fe]Europium to iron abundance ratiophys.abunddoublee_[Eu/Fe]Error on [Eu/Fe]stat.error;phys.abunddoublef_[Eu/Fe]Flag on [Eu/Fe] (2)meta.codeintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGALAH Name (GALAH NNNNNNNNNNNNNNN)meta.id;meta.maincharGNameGroup Name ([OPH2017] NNNN)meta.idchareEccentricitysrc.orbital.eccentricityfloate_eError on estat.errorfloatzmaxMaximum distance above Galactic planepcpos.cartesian.z;pos.galacticinte_zmaxError on zmaxpcstat.errorintRperiPerigalactic distance of the Galactic orbitkpcpos.distance;pos.galacticfloate_RperiError on Rperikpcstat.errorfloatRapoApogalactic distance of the Galactic orbitkpcpos.distance;pos.galacticfloate_RapoError on Rapokpcstat.errorfloat[Mn/Fe]Manganese to iron abundance ratiophys.abunddoubleSimbadSimbad column added by the CDSmeta.ref.urlcharGaiaDR2Gaia DR2 identifiermeta.idGmagGaia DR2 G-band magnitudemagphot.mag;em.optdoubleBP-RPGaia DR2 BP-RP color indexmagphot.color;em.opt.B;em.opt.RdoubleRVsyntBarycentric radial velocity from cross-correlation against synthetic spectrakm/sphys.veloc;pos.heliocentricdoublee_RVsyntError on RVsyntkm/sstat.errordoubleflagcannonFlags for spectrum information in a bitmask format (1)meta.code.errorintTeffEffective temperatureKphys.temperature.effectivedoublee_TeffError on TeffKstat.error;phys.temperature.effectivedoubleloggSurface gravitylog(cm.s**-2)phys.gravitydoublee_loggError on logglog(cm.s**-2)stat.errordouble[Fe/H]Iron abundancephys.abund.Fedoublee_[Fe/H]Error on [Fe/H]stat.error;phys.abund.FedoublevmicMicroturbulence velocitykm/sphys.veloc.microTurbdoublee_vmicError on vmickm/sstat.errordoublevsiniLine of sight rotational velocitykm/sphys.veloc.rotat;spect.linedoublee_vsiniError on vsinikm/sstat.error;phys.veloc.rotatdouble[alpha/Fe]? {alpha} enhancement, determined as an error-weighted combination of Mg, Si, Ca, Ti abundancesphys.abunddoublenullablee_[alpha/Fe]? Error on [alpha/Fe]stat.error;phys.abunddoublenullable[Li/Fe]Lithium to iron abundance ratiophys.abunddoublee_[Li/Fe]Error on [Li/Fe]stat.error;phys.abunddoublef_[Li/Fe]Flag on [Li/Fe] (2)meta.codeint[C/Fe]Carbon to iron abundance ratiophys.abund.Fe;arith.ratiodoublee_[C/Fe]Error on [C/Fe]stat.error;phys.abunddoublef_[C/Fe]Flag on [C/Fe] (2)meta.codeint[O/Fe]Oxygen to iron abundance ratiophys.abund.Fe;arith.ratiodoublee_[O/Fe]Error on [O/Fe]stat.error;phys.abunddoublef_[O/Fe]Flag on [O/Fe] (2)meta.codeint[Na/Fe]Sodium to iron abundance ratiophys.abund.Fe;arith.ratiodouble_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.mainf_[Na/Fe]Flag on [Na/Fe] (2)meta.codeint[Mg/Fe]? Magnesium to iron abundance ratiophys.abund.Fe;arith.ratiodoublenullablee_[Mg/Fe]? Error on [Mg/Fe]stat.error;phys.abunddoublenullablef_[Mg/Fe]Flag on [Mg/Fe] (2)meta.codeint[Al/Fe]Aluminum to iron abundance ratiophys.abunddoublee_[Al/Fe]Error on [Al/Fe]stat.error;phys.abunddoublef_[Al/Fe]Flag on [Al/Fe] (2)meta.codeint[Si/Fe]? Silicon to iron abundance ratiophys.abund.Fe;arith.ratiodoublenullablee_[Si/Fe]? Error on [Si/Fe]stat.error;phys.abunddoublenullablef_[Si/Fe]Flag on [Si/Fe] (2)meta.codeint[K/Fe]Potassium to iron abundance ratiophys.abunddoublef_[Ca/Fe]Flag on [Ca/Fe] (2)meta.codeint[Sc/Fe]Scandium to iron abundance ratiophys.abunddoublee_[Sc/Fe]Error on [Sc/Fe]stat.error;phys.abunddoublef_[Sc/Fe]Flag on [Sc/Fe] (2)meta.codeint[Ti/Fe]? Titanium to iron abundance ratiophys.abund.Fe;arith.ratiodoublenullablee_[Ti/Fe]? Error on [Ti/Fe]stat.error;phys.abunddoublenullablef_[Ti/Fe]Flag on [Ti/Fe] (2)meta.codeint[V/Fe]Vanadium to iron abundance ratiophys.abunddoublee_[V/Fe]Error on [V/Fe]stat.error;phys.abunddouble