J/MNRAS/484/2000ivo://CDS.VizieR/J/MNRAS/484/2000doi:10.26093/cds/vizier.74842000CDSDeepakReddy B.E.2024-08-19T20:16:31Z2022-09-20T12:11:39ZCDS support team

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

cds-question@unistra.frsurveyschemical-abundanceseffective-temperaturegiant-starsvisible-astronomyIn this article, we speculate on the possible mechanisms for Li enhancement origin in RGB stars based on a large data set of around 340299 stars collected from the GALAH survey combined with the Gaia astrometry. Data has 51982 low mass (M=<2M_{sun}_) RGB stars with reliable atmospheric parameters. The data set shows a well-populated RGB with well-defined luminosity bump and red clump with significant number of stars at each of these two key phases. We found 335 new Li-rich RGB stars with Li abundance, A(Li)>=1.80+/-0.14dex, of which 20 are super Li-rich with A(Li)>=3.20dex. Most of them appear to be in the red clump region which, when combined with stellar evolutionary time-scales on RGB, indicates that the Li enhancement origin may lie at RGB tip during He-flash rather than by external source of merging of sub-stellar objects or during luminosity bump evolution. Kinematic properties of sample stars suggest that Li-rich giants are relatively more prevalent among giants of thin disc compared to thick disc and halo.2019MNRAS.484.2000Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/484/2000CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/478/4513 : GALAH Survey DR2 (Buder+, 2018)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/484/2000https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/484/2000http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/484/2000https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/484/2000https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/484/2000http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/484/2000GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/484/2000/suptable (Stellar parameters of Li-rich giants with Li abundance of A(Li)>=1.8dex in our sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/484/2000/suptable?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/484/2000/suptable?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/484/2000/suptable?GETtext/xml+votable180.050000true300.5770972-69.18763920.0055555555555555566/4107 12458 19039 19156 19234 20571 20592 20633 20748 20879 20888 20901 21003 21398 21839 21888 22281 22296 22330 22740 22751 23001 23120 23359 24580 24583 24592 24606-24607 24628 24658 24841 28688 28693 28756 29410 29416 29424 29618-29619 29849 30098 30113 30141 30185 30535 30795 30875 30978-30979 31104 31772 31774 31877 31888-31889 32829 32932 34850 36943 36980 37057 37123 37126 37148 37156 37159 37161 37249 37258 37281-37282 37613 37620 37626 37632 37642 37772 38102 38110 38139 38150 38158 38161-38162 38166 38177 38184 38188-38189 38199 38231 38233 38259 38275 38278 38295 38306 38356 38384 38469 38481 38485 38489-38490 38514 38518 38524 38595 38598 38606 38626 38630 38633 38691 38699 38738 38742 38760 38763 38795 38820 38846 38852 38857 38869 39024 39037 39519 39595 39610 39674 39680 39723 39808 39959 39965 39991 40025 40034 40038 40040 40129 40229 40329 40333 40346 40520 40522 40550 40655 41023 41043-41044 41059 41068 41074 41076 41085 41146 41148-41150 41158 41165-41167 41194 41261-41263 41272 41289 41311 41334 41336 41345 41347-41348 41355 41358 41365 41368 41371 41377 41973 41976 41979 41991 42016 42021-42022 42025 42028 42035 42040 42054 42067 42074 42078 42253 42256 42258 42260 42650 42668 42684 42690 42696 42699 42701 42732 42891 42898-42899 42927 43126 43133 43189 43210 43216 43219 43221 43244 43248 43254 43260 43275 43282 43287 43293-43294 43299 43307 43312 43337 43360 43380 43394 43402 43432 43508 43549 43554 43556 43581 43588 43591 43622 43636 43640 43648 43669-43670 43752 43790 43973 44047 44088 44172 44690 45174 45368 45370 45379 45422 45449-45450 45494 45641 45864 45888 45908 45915 46654 47144 47149 47151 47163 47254 47280 47334 47412 47425 47525 47622 47624 47628 47631-47632 47645 47667 47691 47714-47715 47746 47760-47762 47793 47855 47866 47965 48000 48169 48173 48233 48257 48642 48690-48691 48972-48973https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/484/2000?format=asciiOpticaldefaultJ/MNRAS/484/2000/suptableStellar parameters of Li-rich giants with Li abundance of A(Li)>=1.8dex in our sampleSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject IDmeta.id;meta.mainintGaiaDR2Gaia DR2 source idmeta.idTeffEffective temperature (1)Kphys.temperature.effectivefloate_TeffError on Teff (1)Kstat.error;phys.temperature.effectivefloatloggSurface gravity (1)log(cm.s**-2)phys.gravityfloate_loggError on logg (1)log(cm.s**-2)stat.errorfloat[Fe/H]Iron to hydrogen abundance ratiophys.abund.Fe;arith.ratiofloate_[Fe/H]Error on [Fe/H]stat.error;phys.abund.FefloatVmagApparent visual magnitudemagphot.mag;em.opt.VfloatlogLStar luminosity (2)log(solLum)phys.luminosityfloate_logLError on logL (2)log(solLum)stat.errorfloatA(Li)Lithium abundancephys.abundfloate_A(Li)Error on A(Li)stat.errorfloat_RAPosition from Gaia DR2 (Cat. I/345) (right ascension part)degpos.eq.ra;meta.main_DEPosition from Gaia DR2 (Cat. I/345) (declination part)degpos.eq.dec;meta.main