J/A+A/654/A150ivo://CDS.VizieR/J/A+A/654/A150doi:10.26093/cds/vizier.36540150CDSGregorio-Hetem J.Lefloch B.Hetem A.Montmerle T.Fernandes B.,Mendoza E.F.De Simone M.2025-11-27T20:01:02Z2021-10-25T08:33:16ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsinterstellar-mediuminfrared-sourcesThe relationship between young stellar clusters and their respective parental molecular clouds remains an open issue. Recent inquiries consider the similarities between substructures of clouds and clusters and whether they are a coincidence or, rather, an indication of a physical relationship. To address these issues, we studied the CMa OB1/R1 region, which shows evidence of a complex star formation history. We obtained molecular cloud mapping with the IRAM-30 metre telescope to reveal the physical conditions of an unexplored side of the CMa region with the aim of comparing the morphology of the clouds to the distribution of young stellar objects (YSOs). We also studied the cloud kinematics in pursuit of gradients and jet signatures that could trace different star formation scenarios. The YSOs were selected on the basis of astrometric data from Gaia EDR3 that characterize the moving groups. The distance of 1099_-24_^+25^pc was obtained for the sample, based on the mean error-weighted parallax. Optical and near-infrared photometry was used to verify the evolutionary status and circumstellar characteristics of the YSOs. Among the selected candidates, we found 40 members associated with the cloud: 1 Class I, 11 Class II, and 28 Class III objects. Comparing the spatial distribution of the stellar population with the cores revealed by the ^13^CO map, we verified that peaks of emission coincide with the position of YSOs, confirming the association of these objects to their dense natal gas. Our observations support the large-scale scenario of the CMa shell-like structure formation as a relic of successive supernova events.2021A&A...654A.150Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/654/A150CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/310/210 : Stellar composition of CMa R1 (Shevchenko+, 1999)J/A+A/506/711 : Canis Major R1 X-ray sources (Gregorio-Hetem+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/654/A150https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/654/A150http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/654/A150https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/654/A150https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/654/A150http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/654/A150GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/654/A150/tablea12 (Membership probability and Gaia EDR3 data (table A1) and infrared photometry (table A2) for stellar populations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/654/A150/tablea12?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/654/A150/tablea12?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/654/A150/tablea12?GETtext/xml+votable180.050000true108.5561389-11.8750.005555555555555556Cone search capability for table J/A+A/654/A150/list (List of fits datacubes)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/654/A150/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/654/A150/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/654/A150/list?GETtext/xml+votable180.050000true108.43705-12.157510.0055555555555555566/21636-21637 216398.157980699529898e-21 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/654/A150?format=asciiInfrareddefaultJ/A+A/654/A150/tablea12Membership probability and Gaia EDR3 data (table A1) and infrared photometry (table A2) for stellar populationsSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaEDR3Gaia EDR3 source idmeta.id;meta.mainn_GaiaEDR3Note for stars identified as H{alpha} emitters (1)meta.notecharPmembMembership probability%statintplxParallaxmaspos.parallax.trigfloate_plxParallax errormasstat.error;pos.parallaxfloatpmRAProper motion along RA, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloate_pmRAProper motion along RA errormas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion along DEmas/yrpos.pm;pos.eq.decfloate_pmDEProper motion along DE errormas/yrstat.error;pos.pm;pos.eq.decfloatGmagGaia G magnitudemagphot.mag;em.optfloatBPmagGaia BP magnitudemagphot.mag;em.opt.BfloatRPmagGaia RP magnitudemagphot.mag;em.opt.RfloatClassClassification (I, II or III)meta.code.classchar2MASS2MASS name (HHMMSSss+DDMMSSs)meta.idcharJmag2MASS J magnitudemagphot.mag;em.IR.JfloatHmag2MASS H magnitudemagphot.mag;em.IR.HfloatKmag2MASS K magnitudemagphot.mag;em.IR.KfloatW1magWISE W1 magnitudemagphot.mag;em.IR.3-4umfloatW2magWISE W2 magnitudemagphot.mag;em.IR.4-8umfloatW3magWISE W3 magnitudemagphot.flux.density;em.IR.8-15umfloatW4magWISE W4 magnitudemagphot.flux.density;em.IR.15-30umfloat_RAPositions from Gaia EDR3 (right ascension part)degpos.eq.ra;meta.main_DEPositions from Gaia EDR3 (declination part)degpos.eq.dec;meta.mainJ/A+A/654/A150/listList of fits datacubesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintNzNumber of slicesmeta.numberintbVradLower value of radial velocity intervalm/sphys.veloc;pos.heliocentricintBVradUpper value of radial velocity intervalm/sphys.veloc;pos.heliocentricintdVradRadial velocity resolutionm/sspect.resolutionintFreqReference frequencyMHzem.freqdoublesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fits