J/MNRAS/467/2943ivo://CDS.VizieR/J/MNRAS/467/2943doi:10.26093/cds/vizier.74672943CDSSharma S.Pandey A.K.Ojha D.K.Bhatt H.Ogura K.Kobayashi N.,Yadav R.Pandey J.C.2024-08-17T20:18:16Z2019-12-16T10:00:04ZCDS support team

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

cds-question@unistra.frh-ii-regionsyoung-stellar-objectsinfrared-photometryvisible-astronomybroad-band-photometrystellar-agesstellar-massesstellar-distanceDeep optical photometric data on the NGC 7538 region were collected and combined with archival data sets from the Chandra, 2MASS and Spitzer surveys to generate a new catalogue of young stellar objects (YSOs) including those not showing infrared excess emission. This new catalogue is complete down to 0.8M_{sun}_. The nature of the YSOs associated with the NGC 7538 region and their spatial distribution are used to study the star-formation process and the resultant mass function (MF) in the region. Out of the 419 YSOs, ~91 per cent have ages between 0.1 and 2.5Myr and ~86 per cent have masses between 0.5 and 3.5M_{sun}_, as derived by the spectral energy distribution fitting analysis. Around 24, 62 and 2 per cent of these YSOs are classified to be class I, class II and class III sources, respectively. The X-ray activities for the class I, class II and class III objects are not significantly different from each other. This result implies that the enhanced X-ray surface flux due to the increase in the rotation rate may be compensated for by the decrease in the stellar surface area during the pre-main-sequence evolution. Our analysis shows that the O3V type high-mass star IRS 6 may have triggered the formation of young low-mass stars up to a radial distance of 3pc. The MF shows a turn-off at around 1.5M_{sun}_ and the value of its slope {Gamma} in the mass range 1.5<M/M_{sun}_<6 is -1.76+/-0.24, which is steeper than the Salpeter value.2017MNRAS.467.2943Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/467/2943CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/439/3719 : Embedded clusters infrared photometry (Chavarria+, 2014)J/MNRAS/443/3218 : NGC 7538 IRS 1-3 and IRS 9 sources (Mallick+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/467/2943https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/467/2943http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/467/2943https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/467/2943https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/467/2943http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/467/2943GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/467/2943/table3 (Information for 890 cataloged YSOs in the NGC 7538 region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/467/2943/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/467/2943/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/467/2943/table3?GETtext/xml+votable180.050000true348.143333361.45313890.005555555555555556Cone search capability for table J/MNRAS/467/2943/table4 (Information for 53 newly identified YSOs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/467/2943/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/467/2943/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/467/2943/table4?GETtext/xml+votable180.050000true348.454666761.50427780.0055555555555555566/14316-143171.1166583743361574e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/467/2943?format=asciiOpticalInfrareddefaultJ/MNRAS/467/2943/table3Information for 890 cataloged YSOs in the NGC 7538 regionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDName (G1)meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainClassaClassification by Chavarria et al., 2014MNRAS.439.3719C, Cat. J/MNRAS/439/3719 based on IRAC slopemeta.code.classcharClassbClassification by IRAC TCD (C=contamination, nC=not classified.)meta.code.classcharClasscClassification by Ojha et al. (2004ApJ...616.1042O) and Mallick et al. (2014MNRAS.443.3218M, Cat. J/MNRAS/443/3218) through NIR TCDsmeta.code.classcharClassdClassification by H{alpha} and X-ray emission (G2)meta.code.classcharJ/MNRAS/467/2943/table4Information for 53 newly identified YSOsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identifier, S_NNmeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainJmag2MASS J magnitudemagphot.mag;em.IR.Jfloate_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag2MASS H magnitudemagphot.mag;em.IR.Hfloate_Hmag? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKmag2MASS K magnitudemagphot.mag;em.IR.Kfloate_Kmag? rms uncertainty on Kmagmagstat.error;phot.mag;em.IR.KfloatnullableClassdClassification by H{alpha} and X-ray emission (G2)meta.code.classcharJ/MNRAS/467/2943/table5Information for 74 optically identified YSOs along with their magnitudes and coloursrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDName (G1)meta.id;meta.maincharVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.VfloatU-B? U-B colour indexmagphot.color;em.opt.U;em.opt.Bfloatnullablee_U-B? rms uncertainty on U-Bmagstat.error;phot.color;em.opt.UfloatnullableB-V? B-V colour indexmagphot.color;em.opt.B;em.opt.Vfloatnullablee_B-V? rms uncertainty on B-Vmagstat.error;phot.color;em.opt.BfloatnullableV-R? V-R colour indexmagphot.color;em.opt.V;em.opt.Rfloatnullablee_V-R? rms uncertainty on V-Rmagstat.error;phot.color;em.opt.VfloatnullableV-IV-I colour indexmagphot.color;em.opt.V;em.opt.Ifloate_V-Irms uncertainty on V-Imagstat.error;phot.color;em.opt.VfloatAgeAge, derived from the optical CMDMyrtime.agefloate_Agerms uncertainty on AgeMyrstat.error;time.agefloatMassMass, derived from the optical CMDsolMassphys.massfloate_Massrms uncertainty on MasssolMassstat.error;phys.massfloatJ/MNRAS/467/2943/table6Stellar parameters of selected 419 YSOs derived by using the SED fitting analysisrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDName (G1)meta.id;meta.maincharNNumber of data usedmeta.numberintClassEvolutionnary classmeta.code.classcharchi2Minimum chi^2^stat.fit.chi2;stat.minfloatDistDistancekpcpos.distancefloate_Distrms uncertainty on Distkpcstat.errorfloatAVExtinction in V bandmagphys.absorption;em.opt.Vfloate_AVrms uncertainty on AVmagstat.errorfloatAgeStellar ageMyrtime.agefloate_Agerms uncertainty on AgeMyrstat.error;time.agefloatMassStellar masssolMassphys.massfloate_Massrms uncertainty on MasssolMassstat.error;phys.massfloatJ/MNRAS/467/2943/table7Spectral parameters of the X-ray sources having NIR counterparts and identified as YSOsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDName (G1)meta.id;meta.maincharl_NHLimit flag on NHmeta.code.errorcharNH? Hydrogen column density1e+22cm**-2phys.columnDensityfloatnullableE_NH? Error on NH (upper value)1e+22cm**-2stat.error;stat.maxfloatnullablee_NH? Error on NH (lower value)1e+22cm**-2stat.errorfloatnullablel_kTLimit flag on kTmeta.code.error;phys.energycharkT? Plasma temperaturekeVphys.temperaturefloatnullableE_kT? Error on kT (upper value)keVstat.error;stat.maxfloatnullablee_kT? Error on kT (lower value)keVstat.error;phys.energyfloatnullablelogLXX-ray luminosity (in erg/s)log(1e-07W)phys.luminosity;em.X-rayfloate_logLXError on logLX (lower value)log(1e-07W)stat.errorfloatE_logLXError on logLX (upper value)log(1e-07W)stat.error;stat.maxfloat