J/ApJ/984/58ivo://CDS.VizieR/J/ApJ/984/58doi:10.26093/cds/vizier/ba-yr-1tCDSHuson D.Cowan I.Sizemore L.Kounkel M.Hutchinson B.2026-07-02T12:01:18Z2025-10-01T11:19:39ZCDS support team

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

cds-question@unistra.frstellar-populationseffective-temperaturemetallicityvisible-astronomyspectroscopyWe present a new processing of XP spectra for 220 million stars released in Gaia DR3. The new data model is capable of handling objects with Teff between 2000 and 50000K and with between 0 and 10, including objects of multitude of masses and evolutionary stages. This includes for the first time ever robust processing of spectroscopic parameters for pre-main-sequence stars, with sensitivity toward their age. Through this analysis we examine the distribution of young low-mass stars with ages of up to 20 Myr in the solar neighborhood, and we identify a new massive (>1000 stars) population, Ophion, which is found east of Sco-Cen. This population appears to be fully disrupted, with negligible kinematic coherence. Nonetheless, due its young age it appears to still persist as a spatial overdensity. Through improved determination of ages of the nearby stars, it may be possible to better recover the star-forming history of the solar neighborhood outside of the moving groups.2025ApJ...984...58Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/984/58CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/984/58https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/984/58http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/984/58https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/984/58https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/984/58http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/984/58GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/984/58/table1 (Stellar Parameters Derived from XP Spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/984/58/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/984/58/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/984/58/table1?GETtext/xml+votable180.050000true44.9961550.0056150.005555555555555556Cone search capability for table J/ApJ/984/58/table2 (Stellar Parameters Derived from RVS Spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/984/58/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/984/58/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/984/58/table2?GETtext/xml+votable180.050000true45.058168060.127401940.0055555555555555560/0-11 6/https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/984/58?format=asciiOpticaldefaultJ/ApJ/984/58/table1Stellar Parameters Derived from XP SpectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordGaiaDR3Gaia DR3 unique identifiermeta.id;meta.mainRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainindexedlogTefflog effective temperaturelog(K)phys.temperature.effectivefloate_logTeffUncertainty in logTefflog(K)stat.error;phys.temperature.effectivefloatlog(g)log surface gravitylog(cm.s**-2)phys.gravityfloate_log(g)Uncertainty in log(g)log(cm.s**-2)stat.errorfloat[Fe/H]Metallicitylog(Sun)phys.abund.Zfloate_[Fe/H]Uncertainty in [Fe/H]log(Sun)stat.error;phys.abund.FefloatJ/ApJ/984/58/table2Stellar Parameters Derived from RVS SpectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR3Gaia DR3 unique identifiermeta.id;meta.mainRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainindexedlogTefflog effective temperaturelog(K)phys.temperature.effectivefloate_logTeffUncertainty in logTefflog(K)stat.error;phys.temperature.effectivefloatlog(g)log surface gravitylog(cm.s**-2)phys.gravityfloate_log(g)Uncertainty in log(g)log(cm.s**-2)stat.errorfloat[Fe/H]Metallicitylog(Sun)phys.abund.Zfloate_[Fe/H]Uncertainty in [Fe/H]log(Sun)stat.error;phys.abund.Fefloat