J/AJ/105/2299ivo://CDS.VizieR/J/AJ/105/2299doi:10.26093/cds/vizier.51052299CDSSODERBLOM D.R.PILACHOWSKI C.A.FEDELE S.B.JONES B.F.2023-04-06T16:49:27Z1997-12-09T20:01:58ZCDS support team

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

cds-question@unistra.frg-starsdwarf-starschemical-abundancesWe draw upon a recent study of the membership of the Ursa Major Group (UMaG) to examine lithium among 0.3 Gyr old solar-type stars. For most G and K dwarfs, Li confirms the conclusions about membership in UMaG reached on the basis of kinematics and chromospheric activity. G and K dwarfs in UMaG have less Li than comparable stars in the Pleiades. This indicates that G and K dwarfs undergo Li depletion while they are on the main sequence, in addition to any pre-main-sequence depletion they may have experienced. Moreover, the Li abundances of the Pleiades K dwarfs cannot be attributed to main-sequence depletion alone, demonstrating that pre-main-sequence depletion of Li also takes place. The Sun's Li abundance implies that the main-sequence mechanism becomes less effective with age, otherwise the Sun would have even less Li than it does. The hottest stars in the UMaG (T(eff) >~ 6800K) have Li abundances like those of hot stars in the Pleiades and Hyades and in T Tauris, and the two genuine UMaG members with temperatures near Boesgaard's Li chasm have Li abundances consistent with that chasm developing fully by 0.3 Gyr for stars with UMaG's metallicity ([Fe/H] = -0.08 +/- 0.09). We see differences in the abundance of Li between UMaG members of the same spectral types, indicating that a real spread in the lithium abundance exists within this group.1993AJ....105.2299Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/105/2299CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/105/2299https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/105/2299http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/105/2299https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/105/2299https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/105/2299http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/105/2299GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/105/2299/table1Lithium abundances of UMaG solar-type starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMember[abc] Membership probability as: a: Probable member b: Possible member c: Probable non-membermeta.code.membercharHDHenry Draper numbermeta.id;meta.mainintm_HDMultiplicity index on HD numbermeta.code.multipcharHR[]? Harvard Revised (Brigth Star) numbermeta.idintm_HRMultiplicity index on HR numbermeta.code.multipcharNameOther namemeta.idcharSpSpectral typesrc.spTypecharB-V(B-V) colormagphot.color;em.opt.B;em.opt.Vfloatu_B-VUncertainty flag on B-Vmeta.code.errorcharTeffEffective temperature (average of the temperatures listed in table2)Kphys.temperature.effectiveintu_TeffUncertainty flag on B-Vmeta.code.errorcharl_W(Li)Llimit flag on W(Li)Lmeta.code.errorcharW(Li)L[]? Measured equivalent width for Li 6708 A feature from Lick Hamilton spectrographpmspect.line.eqWidthfloatu_W(Li)Luncertainty flag on W(Li)Lmeta.code.errorcharl_W(Li)Klimit flag on W(Li)Kmeta.code.errorcharW(Li)K[]? Measured equivalent width for Li 6708 A feature from Kitt Peakpmspect.line.eqWidthfloatu_W(Li)Kuncertainty flag on W(Li)Kmeta.code.errorcharl_W(Li)Blimit flag on W(Li)Bmeta.code.errorcharW(Li)B[]? Measured equivalent width for Li 6708 A feature from Boesgaard et al. (1988)0.1pmspect.line.eqWidthfloatW(Li)R[]? Measured equivalent width for Li 6708 A feature from Lick Reticonpmspect.line.eqWidthfloatl_W(Li)Elimit flag on W(Li)Emeta.code.errorcharW(Li)E[]? Measured equivalent width for Li 6708 A feature from ESOpmspect.line.eqWidthfloatl_W(Li)Ilimit flag on W(Li)Imeta.code.errorcharW(Li)I[]? Equivalent width for Li 6708 A feature (origin not precised)0.1pmspect.line.eqWidthintl_<W(Li)>limit flag on <W(Li)>meta.code.errorchar<W(Li)>Adopted mean equivalent widthpmspect.line.eqWidthfloatl_log(N(Li))limit flag on log(N(Li))meta.code.errorcharlog(N(Li))Log of the lithium abundance, log(N(Li)), where log N(H) = 12phys.abundfloatu_log(N(Li))Uncertainty flag on B-Vmeta.code.errorcharJ/AJ/105/2299/table2*Colors and temperatures of UMaG candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHenry Draper numbermeta.id;meta.mainintm_HDMultiplicity index on HD numbermeta.code.multipcharB-V(B-V) colormagphot.color;em.opt.B;em.opt.VfloatTeff(B-V)Effective temperature inferred from (B-V)Kphys.temperature.effectiveintb-y[]? Stromgren color index (b-y)magphot.color;em.opt.B;em.opt.VfloatTeff(b-y)[]? Effective temperature inferred from color index (b-y)Kphys.temperature.effectiveintBeta[]? Stromgren beta indexmagphot.colorfloatTeff(Beta)[]? Effective temperature inferred from beta indexKphys.temperature.effectiveintV-I[]? Johnson color index (V-I)magphot.color;em.opt.V;em.opt.IfloatTeff(V-I)[]? Effective temperature inferred from color index (V-I)Kphys.temperature.effectiveint