J/MNRAS/504/L17ivo://CDS.VizieR/J/MNRAS/504/L17doi:10.26093/cds/vizier.75049017CDSTeixeira P.S.Alves J.Sicilia-Aguilar A.Hacar A.Scholz A.2024-11-06T20:33:48Z2024-04-26T10:46:33ZCDS support team

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

cds-question@unistra.frstellar-associationsyoung-stellar-objectsopen-star-clustersmolecular-cloudsvisible-astronomynarrow-band-photometryproper-motionsastrometryextinctionWe use Gaia DR2 data to survey the classic Monoceros OB1 region and look for the existence of a dispersed young population, co-moving with the cloud complex. An analysis of the distribution of proper motions reveals a 20-30 Myr association of young stars, about 300-400 pc away from the far side of the Mon OB1 complex, along the same general line of sight. We characterize the new association, Monoceros OB4, and estimate it contains between 1400 and 2500 stars, assuming a standard initial mass function, putting it on par in size with NGC 2264. We find from the internal proper motions that Mon OB4 is unbound and expanding. Our results seem to unveil a larger and more complex Monoceros star formation region, suggesting an elongated arrangement that seems to be at least 300 x 60 pc.2021MNRAS.504L..17Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/504/L17CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/504/L17https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/504/L17http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/504/L17https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/504/L17https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/504/L17http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/504/L17GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/504/L17/table2 (list of candidate members of the new cluster)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/504/L17/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/504/L17/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/504/L17/table2?GETtext/xml+votable180.050000true97.0156915.861830.0055555555555555564/1477 5/5563 5566 5954 5960 5962 6/22246-22247 22258 22261-22263 22269-22271 22434 22440 22443 23621 23623 23665 23667-23669 23671 23673 23676-23677 23679 23765 23809-23811 23814 23820 23823 23844 23847 23852-23853 23936 23940https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/504/L17?format=asciiOpticaldefaultJ/MNRAS/504/L17/table2list of candidate members of the new cluster_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.raindexed_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.decindexedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR2Gaia DR2 Source ID (GaiaDR2Source_ID)meta.id;meta.mainGLONGalactic longitude (l)degpos.galactic.lonGLATGalactic latitude (b)degpos.galactic.latDSource distance in units of parsec (Dist)pcpos.distance;arith.ratiointAvExtinction (Av)magphys.absorptionfloat