J/ApJ/944/L5ivo://CDS.VizieR/J/ApJ/944/L5doi:10.26093/cds/vizier.19449005CDSMallick A.Singh R.Reddy B.E.2025-03-07T20:10:43Z2025-02-28T14:53:07ZCDS support team

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

cds-question@unistra.frchemical-abundancesgiant-starsasteroseismologyvisible-astronomyspectroscopyIn this work, we studied the distribution of lithium abundances in giants as a function of stellar mass. We used a sample of 1240 giants common among Kepler photometric and LAMOST medium-resolution (R~7500) spectroscopic survey fields. The asteroseismic {Delta}P-{Delta}{nu} diagram is used to define core He-burning red clump giants and red giant branch stars with an inert He core. Li abundances have been derived using spectral synthesis for all sample stars. Directly measured values of asteroseismic parameters {Delta}P (or {Delta}{Pi}1) and {Delta}{nu} are either taken from the literature or measured in this study. Of the 777 identified red clump giants, we found 668 low-mass (<=2M_{sun}_) primary red clump giants and 109 high-mass (>2M_{sun}_) secondary red clump giants. Observed Li abundances in secondary red clump giants agree with the theoretical model predictions. The lack of Li-rich giants among secondary red clump giants and the presence of Li-rich, including super Li-rich, giants among primary red clump stars reinforces the idea that helium flash holds the key for Li enrichment among low-mass giants. The results will further constrain theoretical models searching for a physical mechanism for Li enhancement among low-mass red clump giants. Results also serve as observational evidence that only giants with mass less than ~2M_{sun}_ develop a degenerate He core and undergo He flash.2023ApJ...944L...5Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/944/L5CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)V/156 : LAMOST DR7 catalogs (Luo+, 2019)J/A+A/503/541 : Neutral Li in late-type stars non-LTE calcul. (Lind+, 2009)J/ApJ/757/109 : Rot. velocities + Li abundance in K giants (Carlberg+, 2012)J/A+A/540/A143 : Oscillations of red giants with Kepler (Mosser+, 2012)J/ApJ/765/L41 : Asteroseismic classification of KIC objects (Stello+, 2013)J/MNRAS/448/822 : LAMOST candidate members of star clusters (Xiang+, 2015)J/AJ/151/144 : ASPCAP weights for APOGEE chemical elements (Garcia+, 2016)J/A+A/588/A87 : Seismic global parameters of 6111 KIC (Vrard+, 2016)J/ApJS/236/42 : Asteroseismology of ~16000 Kepler red giants (Yu+, 2018)J/MNRAS/484/2000 : Study of Lithium-rich giants with GALAH (Deepak+, 2019)J/ApJ/914/116 : Lithium abundances from LAMOST MRS. I. (Gao+, 2021)J/MNRAS/505/5340 : Lithium-rich stars in the GALAH survey DR3 (Martell+, 2021)J/ApJ/940/12 : HeI{lambda}10830 in red giant stars with HPF (Sneden+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/944/L5https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/944/L5http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/944/L5https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/944/L5https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/944/L5http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/944/L5GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/944/L5/table1 (Derived and adopted parameters of giants)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/944/L5/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/944/L5/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/944/L5/table1?GETtext/xml+votable180.050000true284.96851539.29758610.0055555555555555565/3691 3694-3695 3706 3733-3735 3737 3739-3740 3742 3776-3777 3779-3780 3782 3785 6/14590-14591 14759 14761-14763 14770-14771 14775 14818-14819 14828 14830 14923 14925-14927 14929-14931 14944-14946 14952 14954-14955 14964 14972 15112-15114 15124 15126 15132 15137-15139 15152-15154 15168-15169https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/944/L5?format=asciiOpticaldefaultJ/ApJ/944/L5/table1Derived and adopted parameters of giantsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKIC[4136835/11707798] Kepler Input Catalog identifiermeta.id;meta.mainintTeff[4168/5451] Effective temperature (1)Kphys.temperature.effectiveinte_Teff[75/181] Uncertainty in TeffKstat.error;phys.temperature.effectiveintlogg[1.59/3.4] log surface gravity (1)log(cm.s**-2)phys.gravityfloate_logg[0.006/0.2] Uncertainty in logglog(cm.s**-2)stat.error;phys.gravityfloat[Fe/H][-2.44/0.57] Metallicity (1)log(Sun)phys.abund.Fefloate_[Fe/H][0.1/0.3] Uncertainty in [Fe/H]log(Sun)stat.error;phys.abund.FefloatVTurb[1.14/1.9] Microturbulent velocity (1)km/sphys.veloc.microTurbfloate_VTurb[0/0.03] Uncertainty in VTurbkm/sstat.error;phys.veloc.microTurbfloatMass[0.6/4.9] MasssolMassphys.massfloate_Mass[0.04/1.6] Uncertainty in MasssolMassstat.error;phys.massfloatA(Li)[0.27/3.9] LTE derived Li abundancephys.abundfloate_A(Li)[0.06/0.3] Uncertainty in A(Li)stat.error;phys.abundfloatDelta[-0.37/0.33]? The NLTE correction to A(Li)arith.factorfloatnullableDeltanu[1/18.7] THe asteroseismic {Delta}{nu} valueuHzem.freq;src.varfloate_Deltanu[0.009/1.3] Uncertainty in DeltanuuHzstat.error;em.freq;src.varfloatDeltaP[9.99/357.1] The asteroseismic {Delta}P valuestime.periodfloate_DeltaP[0.16/79.5] Uncertainty in DeltaPsstat.error;time.periodfloatf_DeltaP[1/2] Flag on DeltaP (2)meta.code;time.periodintStatus[0/2]? Evolutionary status code (3)meta.codeintnullableLAMOSTDisplay data from LAMOST MRS DR7 (V/156) within 1"meta.ref.urlcharSimbadSimbad 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.main