J/A+A/691/A284ivo://CDS.VizieR/J/A+A/691/A284doi:10.26093/cds/vizier.36910284CDSRossi M.Romano D.Mucciarelli A.Ceccarelli E.Massari D.Zamorani G.2025-02-18T20:02:12Z2024-11-20T07:47:40ZCDS support team

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

cds-question@unistra.frgalaxieschemical-abundanceshalo-starschemically-peculiar-starseffective-temperatureThe recent detection of super-solar carbon-to-oxygen and nitrogen-to-oxygen abundance ratios in a bunch of metal-poor galaxies at high redshift by the James Webb Space Telescope has sparked renewed interest in exploring the chemical evolution of carbon, nitrogen, and oxygen (the CNO elements) at early times, prompting fresh inquiries into their origins. The main goal of this paper is to shed light onto the early evolution of the main CNO isotopes in our Galaxy and in young distant systems, such as GN-z11 at z=10.6 and GS-z12 at z=12.5. To this aim, we incorporate a stochastic star-formation component into a chemical evolution model calibrated with high quality Milky Way (MW) data, focusing on the contribution of Population III (Pop III) stars to the early chemical enrichment. By comparing the model predictions with CNO abundance measurements from high-resolution spectroscopy of an homogeneous sample of Galactic halo stars, we first demonstrate that the scatter observed in the metallicity range -4.5<=[Fe/H]<=-1.5 can be explained by pre-enrichment from Pop III stars that explode as supernovae (SNe) with different initial masses and energies. Then, by exploiting the chemical evolution model, we provide testable predictions for log(C/N), log(N/O), and log(C/O) vs. log(O/H)+12 in MW-like galaxies observed at different cosmic epochs/redshifts. Finally, by calibrating the chemical evolution model to replicate the observed properties of GN-z11 and GS-z12, we provide an alternative interpretation of their high N/O and C/O abundance ratio, respectively, demonstrating that an anomalously high N or C content can be reproduced through enrichment from faint Pop III SNe. Stochastic chemical enrichment from primordial stars explains both the observed scatter in CNO abundances in MW halo stars and the exceptionally high C/O and N/O ratios in some distant galaxies. These findings emphasize the critical role of Pop III stars in shaping early chemical evolution.2024A&A...691A.284Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/691/A284CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/762/26 : Most metal-poor stars. II. 190 Galactic halo starsJ/A+A/661/A153 : Metal-poor red giant branch stars (Mucciarelli+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/691/A284https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/691/A284http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/691/A284https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/691/A284https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/691/A284http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/691/A284GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/691/A284/table1 (ID, stellar parameters and chemical abundances of the unmixed halo stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/691/A284/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/691/A284/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/691/A284/table1?GETtext/xml+votable180.050000true178.4055133-2.01020220.0055555555555555566/2067 4253 5406 5450 5768 16651 16666 17099 17357 17545 17578 17642 18953 22205 23118 24674 25051 25357 25385 25540 25574 25595 25678 25733 25813 25891 26242 26347 26941 27035 31394 31427 32889 33579 33695 34069 34096 34115 34513 34593 34595 34844 35181 35524 35750 35803 36135 36280 36542 36583 36658 40319 40410 43926 44208 45345 45353 45546 45904 45913 45959 45969 46008 46023 46155 46614 46902 47063 48286 48392 48534 48734https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/691/A284?format=asciidefaultJ/A+A/691/A284/table1ID, stellar parameters and chemical abundances of the unmixed halo starsl_[C/Fe]Limit flag on [C/Fe]meta.code.error;phys.abundchar[C/Fe]Abundance [C/Fe]phys.abundfloate_[C/Fe]? Abundance [C/Fe] errorstat.error;phys.abundfloatnullable[N/Fe]? Abundance [N/Fe]phys.abundfloatnullablee_[N/Fe]? Abundance [N/Fe] errorstat.error;phys.abundfloatnullablel_[O/Fe]Limit flag on [O/Fe]meta.code.error;phys.abundchar[O/Fe]? Abundance [O/Fe]phys.abundfloatnullable[Mg/Fe]? Abundance [Mg/Fe]phys.abundfloatnullablee_[O/Fe]? Abundance [O/Fe] errorstat.error;phys.abundfloatnullablee_[Mg/Fe]? Abundance [Mg/Fe] errorstat.error;phys.abundfloatnullable_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.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR3Gaia DR3 identifiermeta.idTeffEffective temperatureKphys.temperature.effectiveintloggEffective temperature errorlog(cm.s**-2)stat.error;phys.temperature.effectivefloat[Fe/H]Metallicity, [Fe/H]phys.abund.Zfloate_[Fe/H]? Metallicity, [Fe/H], errorstat.error;phys.abund.FefloatnullableNameStar namemeta.id;meta.maincharSimbadNameSimbad column added by the CDSmeta.idcharnullableJ/A+A/691/A284/table2Orbital parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR3Gaia DR3 identifiermeta.idEOrbital energy100000km**2.s**-2src.orbitalfloate_EOrbital energy error100000km**2.s**-2stat.errorfloatLzAngular momentum along the z-axis1000kpc.km.s**-1phys.angMomentumfloate_LzAngular momentum along the z-axis error1000kpc.km.s**-1stat.errorfloatLperpPerpendicular component of the angular momentum1000kpc.km.s**-1phys.angMomentumfloate_LperpPerpendicular component of the angular momentum error1000kpc.km.s**-1stat.errorfloatVlosLine of-sight velocitykm/sphys.velocdoublee_VlosLine of-sight velocity errorkm/sstat.errorfloatNameStar namemeta.id;meta.mainchar