J/MNRAS/488/3211ivo://CDS.VizieR/J/MNRAS/488/3211doi:10.26093/cds/vizier.74883211CDSKovtyukh V.Lemasle B.Kniazev A.Berdnikov L.Bono G.Usenko I.,Grebel E.K.Hajdu G.Pastukhova E.2024-08-20T20:12:10Z2023-02-03T14:57:31ZCDS support team

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

cds-question@unistra.frvariable-starsstellar-distanceeffective-temperatureradial-velocitychemical-abundancesvisible-astronomyspectroscopyWe report the discovery of two new lithium-rich Cepheids in the Milky Way (A(Li)~2.9dex) among the targets of the MAGIC spectroscopic survey with the Southern African Large Telescope spectrographs. The 6707{AA} Li feature is usually not detectable in the atmosphere of Cepheids. Only three Cepheids (two in the Milky Way and one in the Large Magellanic Cloud) had been reported so far with high lithium abundances. We examine the possibility that the Li-rich Cepheids are evolving towards the red giant branch, crossing the instability strip for the first time, as well as other possible scenarios. The two stars are mixed-mode Cepheids pulsating simultaneously in the first and in the second overtone modes. We briefly discuss the possible connection between their unusual chemical composition and their pulsational properties.2019MNRAS.488.3211Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/488/3211CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/488/3211https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/488/3211http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/488/3211https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/488/3211https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/488/3211http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/488/3211GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/488/3211/table1 (Parameters of the lithium-rich Cepheids)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/488/3211/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/488/3211/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/488/3211/table1?GETtext/xml+votable180.050000true120.2032-25.73470.0055555555555555566/2391 14602 40482 41621https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/488/3211?format=asciiOpticaldefaultJ/MNRAS/488/3211/table1Parameters of the lithium-rich Cepheids_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexedSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCepheid namemeta.id;meta.maincharTypeCepheid typemeta.notecharModePulsating modesmeta.codecharRGGalactocentric distancekpcpos.distance;pos.galactocentricfloatDistDistancepcpos.distanceintGLONGalactic longitude (l)degpos.galactic.lonGLATGalactic latitude (b)degpos.galactic.lat_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexedPobsPeriod of pulsationdtime.perioddoubleVmagV magnitudemagphot.mag;em.opt.VfloatJ/MNRAS/488/3211/table2Observations and atmospheric parameters of the lithium-rich CepheidsS/NSignal to noise ratiostat.snrintTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloatVtMicro-turbulence velocitykm/sphys.veloc.microTurbfloat[Fe/H]Iron to hydrogen abundance ratiophys.abund.Fe;arith.ratiofloatRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCepheid namemeta.id;meta.maincharMJDModified Julian Date (JD-2400000)dtime.epochdoubleSpectSpectrograph (SALT HRS, HERMES or CFHT)meta.id;instrcharRefReference for data (1)meta.ref;pos.frameintJ/MNRAS/488/3211/table4LTE abundances in lithium-rich CepheidsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCepheid namemeta.id;meta.mainchar[FeI/H]FeI to hydrogen abundance ratiophys.abund.Fefloate_[FeI/H]Error on [FeI/H]stat.error;phys.abundfloato_[FeI/H]Number of lines used to obtain [FeI/H]meta.numberint[FeII/H]FeII to hydrogen abundance ratiophys.abund.Fefloate_[FeII/H]Error on [FeII/H]stat.error;phys.abundfloato_[FeII/H]Number of lines used to obtain [FeII/H]meta.numberintA(Li)Lithium abundancephys.abundfloate_A(Li)Error on A(Li)stat.errorfloato_A(Li)Number of lines used to obtain A(Li)meta.numberint[C/H]Carbon to hydrogen abundance ratiophys.abundfloate_[C/H]Error on [C/H]stat.error;phys.abundfloato_[C/H]Number of lines used to obtain [C/H]meta.numberint[N/H]Nitrogen to hydrogen abundance ratiophys.abundfloate_[N/H]Error on [N/H]stat.error;phys.abundfloato_[N/H]Number of lines used to obtain [N/H]meta.numberint[O/H]Oxygen to hydrogen abundance ratiophys.abundfloate_[O/H]? Error on [O/H]stat.error;phys.abundfloatnullableo_[O/H]Number of lines used to obtain [O/H]meta.numberint[Na/H]Sodium to hydrogen abundance ratiophys.abundfloate_[Na/H]Error on [Na/H]stat.error;phys.abundfloato_[Na/H]Number of lines used to obtain [Na/H]meta.numberintJ/MNRAS/488/3211/table6Abundance ratios in lithium-rich CepheidsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCepheid namemeta.id;meta.maincharA(Li)Lithium abundancephys.abundfloat[Fe/H]Iron to hydrogen abundance ratiophys.abund.Fe;arith.ratiofloat[C/H]Carbon to hydrogen abundance ratiophys.abundfloat[N/H]Nitrogen to hydrogen abundance ratiophys.abundfloat[O/H]Oxygen to hydrogen abundance ratiophys.abundfloat[Na/H]Sodium to hydrogen abundance ratiophys.abundfloat[C/Fe]Carbon to iron abundance ratiophys.abundfloat[N/Fe]Nitrogen to iron abundance ratiophys.abundfloat[O/Fe]Oxygen to iron abundance ratiophys.abundfloat[Na/Fe]Sodium to iron abundance ratiophys.abundfloat[C/O]Carbon to oxygen abundance ratiophys.abundfloat[N/C]Nitrogen to carbon abundance ratiophys.abundfloat