J/MNRAS/461/2502ivo://CDS.VizieR/J/MNRAS/461/2502doi:10.26093/cds/vizier.74612502CDSYadav R.K.Pandey A.K.Sharma S.Ojha D.K.Samal M.R.Mallick K.K.,Jose J.Ogura K.Richichi A.Irawati P.Kobayashi N.Eswaraiah C.2024-08-16T20:17:49Z2018-03-12T11:11:49ZCDS support team

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

cds-question@unistra.frh-ii-regionsinfrared-photometryvisible-astronomybroad-band-photometrystellar-massesWe present a multiwavelength investigation of the young stellar population and star formation activities around the HII region Sharpless 311. Using our deep near-infrared observations and archival Spitzer-IRAC observations, we have detected a total of 125 young stellar objects (YSOs) in an area of ~86 arcmin^2^. The YSO sample includes eight Class I and 117 Class II candidate YSOs. The mass completeness of the identified YSO sample is estimated to be 1.0M_{sun}_. The ages and masses of the majority of the candidate YSOs are estimated to be in the range ~0.1-5Myr and ~0.3-6M_{sun}_, respectively. The 8um image of S311 displays an approximately spherical cavity around the ionizing source, which was possibly created by the expansion of the H ii region. The spatial distribution of the candidate YSOs reveals that a significant number of them are distributed systematically along the 8-{mu}m emission with a majority clustered around the eastern border of the HII region. Four clumps/compact HII regions are detected in the radio continuum observations at 1280MHz, which may have been formed during the expansion of the HII region. The estimated dynamical age of the region, main-sequence lifetime of the ionizing source, the spatial distribution and ages of the candidate YSOs indicate triggered star formation in the complex.2016MNRAS.461.2502Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/461/2502CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/362/301 : Spectrophotometry of HII region S311 (Garcia-Rojas+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/461/2502https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/461/2502http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/461/2502https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/461/2502https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/461/2502http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/461/2502GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/461/2502/table1 (JHKs photometric data of stars in the S311 region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/461/2502/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/461/2502/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/461/2502/table1?GETtext/xml+votable180.050000true118.14624194-26.366478060.005555555555555556Cone search capability for table J/MNRAS/461/2502/table2 (Photometric data of candidate YSOs identified by using different schemes discussed in Section 4.1)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/461/2502/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/461/2502/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/461/2502/table2?GETtext/xml+votable180.050000true118.15130611-26.379613890.005555555555555556Cone search capability for table J/MNRAS/461/2502/table4 (Inferred physical parameters from SED fits to 16 of 125 candidate YSOs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/461/2502/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/461/2502/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/461/2502/table4?GETtext/xml+votable180.050000true118.15130611-26.379613890.005555555555555556Cone search capability for table J/MNRAS/461/2502/table5 (Ages and masses of the candidate YSOs from V/(V-I) CMDs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/461/2502/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/461/2502/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/461/2502/table5?GETtext/xml+votable180.050000true118.15130611-26.379613890.0055555555555555566/398047.952274030004205e-20 6.118840631666147e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/461/2502?format=asciiOpticalInfrareddefaultJ/MNRAS/461/2502/table1JHKs photometric data of stars in the S311 regionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainJ-HJ-H colour indexmagphot.color;em.IR.J;em.IR.Hfloate_J-Hrms uncertainty on J-Hmagstat.error;phot.color;em.IR.JfloatH-KsH-Ks colour indexmagphot.color;em.IR.H;em.IR.Kfloate_H-Ksrms uncertainty on H-Ksmagstat.error;phot.color;em.IR.HfloatJ-KsJ-Ks colour indexmagphot.color;em.IR.J;em.IR.Kfloate_J-Ksrms uncertainty on J-Ksmagstat.error;phot.color;em.IR.JfloatKsmagKs magnitudemagphot.mag;em.IR.Kfloate_Ksmagrms uncertainty on Ksmagmagstat.error;phot.magfloatJ/MNRAS/461/2502/table2Photometric data of candidate YSOs identified by using different schemes discussed in Section 4.1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintparamindicates inferred physical parameters from SED fits and/or ages and masses of the candidate YSOs in tables 4 and/or 5meta.ref.urlcharID[1/125] Sequential numbermeta.recordintprimaryRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainUmag? U magnitudemagphot.mag;em.opt.Ufloatnullablee_Umag? rms uncertainty on Umagmagstat.error;phot.magfloatnullableBmag? B magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag? rms uncertainty on Bmagmagstat.error;phot.magfloatnullableVmag? V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? rms uncertainty on Vmagmagstat.error;phot.magfloatnullableImag? I magnitudemagphot.mag;em.opt.Ifloatnullablee_Imag? rms uncertainty on Imagmagstat.error;phot.magfloatnullableJmag? J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.magfloatnullableHmag? H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.magfloatnullableKsmag? Ks magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag? rms uncertainty on Ksmagmagstat.error;phot.magfloatnullable[3.6]? IRAC [3.6] magnitudemagphot.mag;em.IR.3-4umfloatnullablee_[3.6]? rms uncertainty on [3.6]magstat.errorfloatnullable[4.5]? IRAC [4.5] magnitudemagphot.mag;em.IR.4-8umfloatnullablee_[4.5]? rms uncertainty on [4.5]magstat.errorfloatnullable[5.8]? IRAC [5.8] magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_[5.8]? rms uncertainty on [5.8]magstat.errorfloatnullable[8.0]? IRAC [8.0] magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0]? rms uncertainty on [8.0]magstat.errorfloatnullableClass[I II] Classficationsrc.classcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/MNRAS/461/2502/table4Inferred physical parameters from SED fits to 16 of 125 candidate YSOsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/125] Sequential numbermeta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainM*Stellar masssolMassphys.massfloate_M*rms uncertainty on M*solMassstat.errorfloatt*Stellar ageMyrtime.agefloate_t*rms uncertainty on t*Myrstat.errorfloatMdiscDisc masssolMassphys.massfloate_Mdiscrms uncertainty on MdiscsolMassstat.errorfloatdMdisc/dtDisc mass loss rate1e-08solMass.yr**-1phys.mass.lossfloate_dMdisc/dtrms uncertainty on dMdisc/dt1e-08solMass.yr**-1stat.errorfloatAVExtinction in V bandmagphys.absorptionfloate_AVrms uncertainty on AVmagstat.errorfloatchi2chi^2^ valuestat.fit.chi2;stat.valuefloatClass[I II] Classificaitonsrc.classcharJ/MNRAS/461/2502/table5Ages and masses of the candidate YSOs from V/(V-I) CMDsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/125] Sequential numbermeta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.error;phot.magfloatV-IV-I colour indexmagphot.color;em.opt.V;em.opt.Ifloate_V-Irms uncertainty on V-Imagstat.error;phot.color;em.opt.Vfloatt*Stellar ageMyrtime.agefloate_t*? rms uncertainty on t*Myrstat.errorfloatnullableM*Stellar masssolMassphys.massfloate_M*rms uncertainty on M*solMassstat.errorfloatClass[I II] Classificaitonsrc.classchar