J/A+A/609/A127ivo://CDS.VizieR/J/A+A/609/A127doi:10.26093/cds/vizier.36090127CDSSantos-Silva T.Gregorio-Hetem J.Montmerle T.Fernandes B.Stelzer B.2018-08-23T07:34:35Z2018-06-12T12:08:52ZCDS support team

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

cds-question@unistra.frstellar-associationsx-ray-sourcesinfrared-photometrystellar-massesstellar-agesThe Canis Major OB1 association has an intriguing scenario of star formation, especially in the region called Canis Major R1 (CMa R1) traditionally assigned to a reflection nebula, but in reality an ionized region. This work is focussed on the young stellar population associated with CMa R1, for which our previous results from ROSAT, optical, and near-infrared data had revealed two stellar groups with different ages, suggesting a possible mixing of populations originated from distinct star formation episodes. The X-ray data allow the detected sources to be characterized according to hardness ratios, light curves, and spectra. Estimates of mass and age were obtained from the 2MASS catalogue and used to define a complete subsample of stellar counterparts for statistical purposes. A catalogue of 387 XMM-Newton sources is provided, of which 78% are confirmed as members or probable members of the CMa R1 association. Flares (or similar events) were observed for 13 sources and the spectra of 21 bright sources could be fitted by a thermal plasma model. Mean values of fits parameters were used to estimate X-ray luminosities. We found a minimum value of log(L_X_[erg/s])=29.43, indicating that our sample of low-mass stars (M*<=0.5 M_{sun}_), which are faint X-ray emitters, is incomplete. Among the 250 objects selected as our complete subsample (defining our "best sample"), 171 are found to the east of the cloud, near Z CMa and dense molecular gas, of which 50% of them are young (<5Myr) and 30% are older (>10Myr). The opposite happens to the west, near GU CMa, in areas lacking molecular gas: among 79 objects, 30% are young and 50% are older. These findings confirm that a first episode of distributed star formation occurred in the whole studied region ~10Myr ago and dispersed the molecular gas, while a second, localized episode (<5Myr) took place in the regions where molecular gas is still present.2018A&A...609A.127Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/609/A127CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/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/609/A127https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/609/A127http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/609/A127https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/609/A127https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/609/A127http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/609/A127GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/609/A127/tableb1 (X-ray sources detected in the combined images of the EPIC cameras PN, MOS1 and MOS2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/609/A127/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/609/A127/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/609/A127/tableb1?GETtext/xml+votable180.050000true105.11875-11.36011110.0055555555555555566/21641 21643-216441.1166583743361574e-19 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/609/A127?format=asciiX-rayInfrareddefaultJ/A+A/609/A127/tableb1X-ray sources detected in the combined images of the EPIC cameras PN, MOS1 and MOS2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCMaXX-ray source identification (G1)meta.id;meta.maincharRAJ2000right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainMLMaximum likelihoodstat.likelihoodfloatCR-PN? Count rate detected in EPIC camera PNct/ksphot.count;em.X-rayfloatnullablee_CR-PN? rms uncertainty on CR-PNct/ksstat.errorfloatnullableCR-MOS1? Count rate detected in EPIC camera MOS1ct/ksphot.count;em.X-rayfloatnullablee_CR-MOS1? rms uncertainty on CR-MOS1ct/ksstat.errorfloatnullableCR-MOS2? Count rate detected in EPIC camera MOS2ct/ksphot.count;em.X-rayfloatnullablee_CR-MOS2? rms uncertainty on CR-MOS2ct/ksstat.errorfloatnullableHR11? PN Hardness ratio (0.5-1.0-2.0keV)phot.flux;arith.ratiofloatnullablee_HR11? rms uncertainty on HR11stat.errorfloatnullableHR21? PN Hardness ratio (1.0-2.0-7.3keV)phot.flux;arith.ratiofloatnullablee_HR21? rms uncertainty on HR21stat.errorfloatnullableHR12? PN Hardness ratio (0.2-0.5-2.0keV)phot.flux;arith.ratiofloatnullablee_HR12? rms uncertainty on HR12stat.errorfloatnullableHR22? PN Hardness ratio (0.5-2.0-4.5keV)phot.flux;arith.ratiofloatnullablee_HR22? rms uncertainty on HR22stat.errorfloatnullableJ/A+A/609/A127/tableb2*Infrared 2MASS photometry, mass, age, and infrared classification of members of CMa R1 region and counterparts to X-ray sourcese_Kmag? rms uncertainty on Kmagmagstat.error;phot.mag;em.IR.KfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCMaXX-ray source identification (G1)meta.id;meta.maincharm_CMaX[abcde] Multiplicity index on CMaXmeta.code.multipcharn_CMaX[*] Note on CMaX (1)meta.notecharDist? Distance from X-ray source centrearcsecpos.angDistancefloatnullable2MASS2MASS IDmeta.idcharJmag? 2MASS J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag? 2MASS H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKmag? 2MASS K magnitudemagphot.mag;em.IR.KfloatnullableQflag2MASS quality flagmeta.code.qualcharMass? MasssolMassphys.massfloatnullableu_Mass[?] Uncertainty flag on Massmeta.code.error;phys.masscharAge? AgeMyrtime.agefloatnullableu_Age[?] Uncertainty lfag on Agemeta.code.error;time.agecharWClassWISE classificationmeta.code.classchar