J/A+A/567/A109ivo://CDS.VizieR/J/A+A/567/A109doi:10.26093/cds/vizier.35670109CDSKumar B.Sharma S.Manfroid J.Gosset E.Rauw G.Naze Y.Yadav R.K.2023-01-06T15:23:42Z2014-07-23T09:22:03ZCDS support team

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

cds-question@unistra.frwolf-rayet-starspre-main-sequence-starsyoung-stellar-objectsinfrared-photometryvisible-astronomybroad-band-photometrystellar-agesThe low obscuration and proximity of the Carina nebula make it an ideal place to study the ongoing star formation process and impact of massive stars on low-mass stars in their surroundings. To investigate this process, we have generated a new catalogue of the pre-main-sequence (PMS) stars in the Carina west (CrW) region and studied their nature and spatial distribution. We have also determined various parameters (reddening, reddening law, age, mass) which are further used to estimate the initial mass function (IMF) and K-band luminosity function (KLF) for the region under study. We obtained deep UBVRI H{alpha} photometric data of the field situated to the west of the main Carina nebula and centered around WR22. Medium-resolution optical spectroscopy of a subsample of X-ray selected objects along with archival data sets from Chandra, XMM-Newton and 2MASS surveys are used for the present study. Our spectroscopic results indicate that the majority of the X-ray sources are late spectral type stars. The region shows a large amount of differential reddening with minimum and maximum values of E(B-V) as 0.25 and 1.1mag, respectively. Our analysis reveals that the total to selective absorption ratio R_V_ is ~3.7+/-0.1 suggesting an abnormal grain size in the observed region. We identify 467 young stellar objects (YSOs) and study their characteristics. The ages and masses of the 241 optically identified YSOs range from ~0.1 to 10Myr and ~0.3 to 4.8M_{sun}_, respectively. However, the majority of them are younger than 1Myr and have masses below 2M_{sun}_. The high mass star WR22 does not seem to have contributed to the formation of YSOs in the CrW region. The initial mass function slope, Gamma in this region is found to be -1.13+/-0.20 in the mass range of 0.5<M/M_{sun}_<4.8. The K-band luminosity function slope ({alpha}) is also estimated as 0.31+/-0.01. We also performed minimum spanning tree analysis of the YSOs in this region which reveals that there are at least ten YSO cores associated with the molecular cloud and that leads to an average core radius and median branch length 0.43pc and 0.28pc, respectively.2014A&A...567A.109Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/567/A109CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/105/258 : UBVRI polarimetry in Car Nebula (Marraco+ 1993)J/A+A/423/579 : Diffuse emissions in Carina nebula (Mizutani+, 2004)J/ApJ/667/963 : Near-infrared photometry of Carina nebula (Sanchawala+, 2007)J/ApJS/194/2 : Chandra Carina Complex Project (CCCP) catalog (Broos+, 2011)J/ApJS/194/6 : Candidate X-ray emitting OB stars in Carina (Povich+, 2011)J/ApJS/194/10 : NIR properties of YSO in the CCCP (Preibisch+, 2011)J/ApJS/194/14 : A Pan-Carina YSO catalog (Povich+, 2011)J/ApJ/739/100 : [NII] observations of Carina Nebula (NGC 3372) (Oberst+, 2013)J/A+A/549/A67 : Embedded YSOs in Carina Nebula complex (Gaczkowski+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/567/A109https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/567/A109http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/567/A109https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/567/A109https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/567/A109http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/567/A109GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/567/A109/table3 (List of the optically identified YSOs along with their derived ages and masses)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/567/A109/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/567/A109/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/567/A109/table3?GETtext/xml+votable180.050000true160.54485806-59.643538060.0055555555555555566/37333 37335 38016 380183.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/567/A109?format=asciiOpticalInfrareddefaultJ/A+A/567/A109/table3List of the optically identified YSOs along with their derived ages and massesRemRemarks (1)meta.notecharSeq[1/241] YSO identification numbermeta.id;meta.mainintprimaryRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainVmagJohnson V-band magnitudemagphot.mag;em.opt.Vfloate_VmagUncertainty on Vmagmagstat.error;phot.magfloatV-IJohnson V-I colour indexmagphot.color;em.opt.V;em.opt.Ifloate_V-IUncertainty on V-Imagstat.error;phot.color;em.opt.VfloatAgeYSOs agesMyrtime.agefloate_AgeUncertainty in YSOs agesMyrstat.error;time.agefloatMassMasssolMassphys.massfloate_MassUncertainty in MasssolMassstat.error;phys.massfloatSimbadSimbad column added by the CDSmeta.ref.urlchar