J/other/RAA/25.Civo://CDS.VizieR/J/other/RAA/25.C5019CDSZhang R.Chen J.Wu C.Wang L.Zha S.Guo S.Han Z.2025-06-02T07:05:25Z2025-05-30T15:35:17ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyopen-star-clustersvisible-astronomychemical-abundancesThe 11th data release of the LAMOST survey provides fundamental stellar parameters but lacks detailed abundance measurements for alpha-elements, crucial for understanding stellar populations and Galactic chemical evolution. In this study, we derive the abundances of oxygen (O), magnesium (Mg), silicon (Si), calcium (Ca), and titanium (Ti) for over 6.8 million stars using LAMOST DR11 low-resolution spectra. To ensure reliable measurements, we select 760 OCs spanning a broad range of ages and apply Monte Carlo sampling for accurate abundance estimates. Additionally, we utilize over 30000 stars from the GALAH DR4 catalog to train an XGBoost model for extracting alpha-element abundances from LAMOST DR11 spectra. Bayesian linear regression is employed to analyze the compositional distribution across the Galactic disk and infer chemical gradients as a function of Galactocentric distance. Our results indicate a general increase in chemical abundances with Galactocentric distance, with oxygen showing the steepest gradient. Our results confirm the overall increase of alpha-element abundances with Galactocentric distance, consistent with previous studies, while minor discrepancies in Mg, Ca, and Ti gradients likely arise from differences in sample selection, observational sensitivity, or Galactic enrichment processes.2025RAA....25c5019Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/RAA/25.C5019CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch 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21438-21439 21450 21456 21458 21462 21467 21471 21475 21495 21692 21719 21734 21754 21774 21915 21927 21930 21947 21987 22003 22023 22030 22035 22044 22053 22058-22059 22089 22112-22113 22118 22123-22124 22130 22136 22146 22160 22162 22170 22176 22183 22205 22210 22225-22226 22231 22239 22247 22249 22254 22260 22268 22305 22311 22314 22320 22328 22408 22433 22439-22440 22446 22466 22473 22497 22499 22501 22721 22785 22809 22821 22833 22854-22855 22857-22860 22863 22869 22871 22880 22887 22892-22893 22895 22897 22905 22954 22993 22999 23003 23008 23030 23165 23261 23281 23284 23364-23365 23376 23410 23421 23457 23520 23527 23538 23549 23552 23573 23580-23581 23583-23584 23629 23637 23641 23654-23656 23663 23665 23667 23670 23674-23675 23677 23679 23685 23696 23717 23741 23745 23749 23752 23761 23763 23765-23766 23768-23770 23773 23779 23796-23797 23803 23805 23807 23818 23820 23840 23842 23852 23855 23866 23906 23920 23931 23938-23939 23943 23946 23950-23952 23958 23960 23962 23972-23973 23977 23979-23982 23994 23996 23998 24001-24002 24025 24032 24057 24064 24096 24114 24121 24123 24125 24130 24153-24154 24169 24173 24181 24188 24228-24229 24250 24253 24261 24266 24272 24281 24291 24324-24326 24330 24333 24335 24344-24345 24348 24355 24361 24363 24365-24367 24369 24375 24379 24383 24386-24387 24399 24410 24418 24423-24424 24449 24465 24472 24477 24479 24481 24483 24485-24486 24489 24491-24492 24496-24497 24499 24502-24503 24508 24510 24516 24520-24522 24524 24526-24527 24545-24546 24553 24555 24570 27632 28233 28483 29294 29619 29939 30293 30359 30366 30381 30439 30590 31071 31094 31135 31496 31551 31756 31759 31790 31812 31865 31895 31991 32125 32129 32162 32267 32533 32537 32598 32687 36827https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/RAA/25.C5019?format=asciiOpticaldefaultJ/other/RAA/25.C5019/ocfinal1Predicting chemical abundances of open clustersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster namemeta.id;meta.maincharRA_ICRSRight ascension (ICRS)degpos.eq.ra;meta.mainDE_ICRSDeclination (ICRS)degpos.eq.dec;meta.mainRVRadial velocitykm/sphys.veloc;pos.heliocentricdoubleRgcGalacto-centric radiuspcpos.distance;pos.galactocentricdoublelogage50Agelog(yr)time.agedouble[O/Fe]meanMean [O/Fe] abundancephys.abunddouble[O/Fe]stdStandard deviation on [O/Fe] abundancestat.stdevdouble[Mg/Fe]meanMean [Mg/Fe] abundancephys.abunddouble[Mg/Fe]stdStandard deviation on [Mg/Fe] abundancestat.stdevdouble[Si/Fe]meanMean [Si/Fe] abundancephys.abunddouble[Si/Fe]stdStandard deviation on [Si/Fe] abundancestat.stdevdouble[Ca/Fe]meanMean [Ca/Fe] abundancephys.abunddouble[Ca/Fe]stdStandard deviation on [Ca/Fe] abundancestat.stdevdouble[Ti/Fe]meanMean [Ti/Fe] abundancephys.abunddouble[Ti/Fe]stdStandard deviation on [Ti/Fe] abundancestat.stdevdoubleSimbadNameSimbad column added by the CDSmeta.idcharnullable