J/MNRAS/499/2196ivo://CDS.VizieR/J/MNRAS/499/2196doi:10.26093/cds/vizier/bg-fk-24mCDSBotelho R.B.Milone A. de C.Melendez J.Alves-Brito A.Spina L.,Bean J.L.2026-08-03T07:30:18Z2023-11-07T09:30:49ZCDS support team

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

cds-question@unistra.frmetallicitychemically-peculiar-starsmilky-way-galaxyvisible-astronomyspectroscopyAbundances of light elements in dwarf stars of different ages are important constraints for stellar yields, Galactic chemical evolution and exoplanet chemical composition studies. We have measured C and N abundances and ^12^C/^13^C ratios for a sample of 63 solar twins spanning a wide range in age, based on spectral synthesis of a comprehensive list of CH A-X and CN B-X features using HARPS spectra. The analysis of 55 thin disc solar twins confirms the dependences of [C/Fe] and [N/Fe] on [Fe/H]. [N/Fe] is investigated as a function of [Fe/H] and age for the first time for these stars. Our derived correlation [C/Fe]-age agrees with works for solar-type stars and solar twins, but the [N/Fe]-age correlation does not. The relations [C,N/Fe]-[Fe/H] and [C,N/Fe]-age for the solar twins lay under solar. ^12^C/^13^C is found correlated with [Fe/H] and seems to have decreased along the evolution of the local thin disc. Predictions from chemical evolution models for the solar vicinity corroborate the relations [C,N/Fe]-[Fe/H], ^12^C/^13^C-age, and [N/O]-[O/H], but do not for the ^12^C/^13^C-[Fe/H] and [C/O]-[O/H] relations. The N/O ratio in the Sun is placed at the high end of the homogeneous distribution of solar twins, which suggests uniformity in the N-O budget for the formation of icy planetesimals, watery superearths, and giant planets. C and N had different nucleosynthetic origins along the thin disc evolution, as shown by the relations of [C/N], [C/O], and [N/O] against [O/H] and age. [C/N] and [C/O] are particularly observed increasing in time for solar twins younger than the Sun.2020MNRAS.499.2196Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/499/2196CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/865/68 : Abundances for 79 Sun-like stars within 100pcJ/MNRAS/474/2580 : Temporal evolution of neutron-capture elementsJ/MNRAS/482/1690 : Thorium in solar twins (Botelho+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/499/2196https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/499/2196http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/499/2196https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/499/2196https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/499/2196http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/499/2196GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/499/2196/table1 (Parameters of the 67 solar twins collected from previous published works)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/499/2196/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/499/2196/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/499/2196/table1?GETtext/xml+votable180.050000true6/222 548 4128 4206 4313 4665 8244 8286 8614 8792 12890 17301 17572 17721 17929 18209 18373 19491 21114 21177 21516 23583 23780 23873 25854 26160 26496 26888 27254 29422 29900 30878 30894 31029 31433 31945 33252 36453 36517 36590 36635 37515 37944 38279 39557 39570 39576 39801 40105 40892 41935 42157 42228 42887 43105 43327 43845 43929 46056 46193 46734 46933 47137 47194 48310 48607 49114https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/499/2196?format=asciiOpticaldefaultJ/MNRAS/499/2196/table1Parameters of the 67 solar twins collected from previous published worksSimbadNameSimbad column added by the CDSmeta.idcharnullablee_[Fe/H]Error on [Fe/H] (1)stat.error;phys.abund.FefloatVmicroMicro-turbulence velocity (2)km/sphys.veloc.microTurbfloate_VmicroError on Vmicro (2)km/sstat.errorfloatVmacroMacro-turbulence velocity (2)km/sphys.velocfloat[O/H]O/H abundance ratio (3)phys.abundfloatTeffEffective temperature (1)Kphys.temperature.effectiveintVsiniRotational velocity (2)km/sphys.veloc.rotatfloatAgeStar age (1)Gyrtime.agefloate_AgeError on Age (1)Gyrstat.error;time.agefloate_[O/H]Error on [O/H] (3)stat.error;phys.abundfloat_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullableNameStar namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinte_TeffError on Teff (1)Kstat.error;phys.temperature.effectiveintloggSurface gravity (1)log(cm.s**-2)phys.gravityfloate_loggError on logg (1)log(cm.s**-2)stat.errorfloat[Fe/H]Fe/H abundance ratio (1)phys.abund.Fe;arith.ratiofloatJ/MNRAS/499/2196/table2The comprehensive list of CH A-X lines used in this work for determining the C abundance in solar twin starsSprangeSpectral range in which the {chi}^2^ is computed0.1nmem.wlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLineLine identification (1)meta.id;spect.linecharlambdaCentral wavelength of the spectral absorption0.1nmem.wl.centralfloatNpixNumber of pixelsmeta.numberintBluecontBlue continuum interval0.1nmem.wlcharRedcontRed continuum interval0.1nmem.wlcharBandVibrational band (arcmin,arcsec)instr.bandpasscharNlinesNumber of blended lines to form the molecular absorptionmeta.numberintJ/MNRAS/499/2196/table3The comprehensive list of CN B-X lines used in this work for determining the N abundance in solar twin starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLineLine identification (1)meta.id;spect.linecharlambdaCentral wavelength of the spectral absorption0.1nmem.wl.centralfloatSprangeSpectral range in which the {chi}^2^ is computed0.1nmem.wlcharNpixNumber of pixelsmeta.numberintBluecontBlue continuum interval0.1nmem.wlcharRedcontRed continuum interval0.1nmem.wlcharBandVibrational band (arcmin,arcsec)instr.bandpasscharNlinesNumber of blended lines to form the molecular absorptionmeta.numberintJ/MNRAS/499/2196/table4Line lists for the CH A-X line regions after the gf calibration to the solar spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLineLine identificationmeta.id;spect.linecharlambdaWavelength0.1nmem.wldoubleSpcodeSpecies code (1)meta.codefloatchiExcitation potential of transition lower leveleVphys.atmol.excitation;phys.atmol.level;phys.atmol.transitionfloatgf? Oscillator strength calibrated to the solar spectrum (2)phys.atmol.oscStrengthdoublenullableSpeciesSpecies identificationmeta.id;meta.maincharJ/MNRAS/499/2196/table5Line lists for the CN B-X line regions after the gf calibration to the solar spectrumgf? Oscillator strength calibrated to the solar spectrum (3)phys.atmol.oscStrengthdoublenullableSpeciesSpecies identificationmeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLineLine identificationmeta.id;spect.linecharlambdaWavelength0.1nmem.wldoublef_lambda[*] Flag on lambda (1)meta.codecharSpcodeSpecies code (2)meta.codefloatchiExcitation potential of transition lower leveleVphys.atmol.excitation;phys.atmol.transition;phys.atmol.levelfloatJ/MNRAS/499/2196/table6The comprehensive list of ^13^CH-^12^CH A-X features used in this work for determining the ^12^C/^13^C isotopic ratio in solar twin starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFeatureFeature namemeta.id;spect.linecharlambdaCentral wavelength of the spectral absorption0.1nmem.wlfloatSprangeSpectral range in which the {chi}^2^ is computed0.1nmem.wlcharNpixNumber of pixelsmeta.numberintBluecontBlue continuum interval0.1nmem.wlcharRedcontRed continuum interval0.1nmem.wlcharBandVibrational band (arcmin,arcsec)instr.bandpasscharNlinesNumber of blended lines to form the molecular absorptionmeta.numberintJ/MNRAS/499/2196/table7Line lists for the ^13^CH-^12^CH A-X feature regions after the gf calibration to the solar spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFeatureFeature namemeta.id;spect.linecharlambdaWavelength0.1nmem.wldoubleSpcodeSpecies codemeta.codedoublechiExcitation potential of transition lower leveleVphys.atmol.excitation;phys.atmol.level;phys.atmol.transitionfloatgfOscillator strength calibrated to the solar spectrumphys.atmol.oscStrengthdoubleSpeciesSpecies identificationmeta.id;meta.maincharJ/MNRAS/499/2196/table8Carbon and nitrogen abundances and ^12^C/^13^C ratio measured in this work relatively to the Sun for 63 solar twinsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.mainchar[C/H]C/H abundance ratiophys.abundfloate_[C/H]Error on [C/H]stat.error;phys.abundfloat[C/Fe]C/Fe abundance ratiophys.abundfloate_[C/Fe]Error on [C/Fe]stat.error;phys.abundfloat[N/H]N/H abundance ratiophys.abundfloate_[N/H]Error on [N/H]stat.error;phys.abundfloat[N/Fe]N/Fe abundance ratiophys.abundfloate_[N/Fe]Error on [N/Fe]stat.error;phys.abundfloatC12C13^12^C/^13^C ratiophys.abundfloate_C12C13Error on C12C13stat.errorfloat