J/ApJ/755/20ivo://CDS.VizieR/J/ApJ/755/20doi:10.26093/cds/vizier.17550020CDSSamal M.R.Pandey A.K.Ojha D.K.Chauhan N.Jose J.Pandey B.2017-12-05T05:11:02Z2014-04-08T07:40:01ZCDS support team

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

cds-question@unistra.frinfrared-photometryh-ii-regionsyoung-stellar-objectsstellar-massesstellar-agesThe Sh2-294 H II region ionized by a single B0V star features several infrared excess sources, a photodissociation region, and also a group of reddened stars at its border. The star formation scenario in this region seems to be quite complex. In this paper, we present follow-up results of Sh2-294 H II region at 3.6, 4.5, 5.8, and 8.0{mu}m observed with the Spitzer Space Telescope Infrared Array Camera (IRAC), coupled with H_2_(2.12{mu}m) observation, to characterize the young population of the region and to understand its star formation history. We identified 36 young stellar object (YSO, Class I, Class II, and Class I/II) candidates using IRAC color-color diagrams. It is found that Class I sources are preferentially located at the outskirts of the H II region and associated with enhanced H_2_emission; none of them are located near the central cluster. Combining the optical to mid-infrared (MIR) photometry of the YSO candidates and using the spectral energy distribution fitting models, we constrained stellar parameters and the evolutionary status of 33 YSO candidates. Most of them are interpreted by the model as low-mass (<4 M_{sun}_) YSOs; however, we also detected a massive YSO (~9 M_{sun}_) of Class I nature, embedded in a cloud of visual extinction of ~24 mag.2012ApJ...755...20Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/755/20CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/114 : MSX6C Infrared Point Source Catalog (Egan+ 2003)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)VII/50 : CO Radial Velocities Toward Galactic H II Regions (Blitz+ 1982)J/A+A/483/209 : Phot. of a stellar cluster near IRAS 07141-092 (Yun+, 2008)J/A+A/470/161 : UBV photometry of HII regions exciting stars (Russeil+, 2007)J/ApJ/649/759 : Bubbles in the galactic disk (Churchwell+, 2006)J/A+A/397/213 : Galactic HII regions (Paladini+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/755/20https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/755/20http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/755/20https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/755/20https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/755/20http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/755/20GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/755/20/table1 (Photometric data in IRAC bands (97 different positions))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/755/20/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/755/20/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/755/20/table1?GETtext/xml+votable180.050000true109.12401-9.495950.005555555555555556Cone search capability for table J/ApJ/755/20/table2 (Inferred physical parameters from SED fits to YSOs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/755/20/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/755/20/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/755/20/table2?GETtext/xml+votable180.050000true109.13042389-9.443050.0055555555555555566/216572.0616683193919197e-20 6.185923063528282e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/755/20?format=asciiInfrareddefaultJ/ApJ/755/20/table1Photometric data in IRAC bands (97 different positions)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintYSOSimbad column added by the CDSmeta.numberintnullableRAJ2000[109.0/109.2] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-9.5/-9.3] Declination (J2000)degpos.eq.dec;meta.main3.6mag[9.6/15] Spitzer/IRAC 3.6 micron band magnitudemagphot.mag;em.IR.3-4umfloate_3.6magUncertainty in 3.6magmagstat.errorfloat4.5mag[9.2/14.8] Spitzer/IRAC 4.5um band magnitudemagphot.mag;em.IR.4-8umfloate_4.5magUncertainty in 4.5magmagstat.errorfloat5.8mag[7.8/14.1] Spitzer/IRAC 5.8um band magnitudemagphot.flux.density;em.IR.4-8umfloate_5.8magUncertainty in 5.8magmagstat.errorfloat8.0mag[8.6/12.4]? Spitzer/IRAC 8.0um band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_8.0mag[0.02/0.2]? Uncertainty in 8.0magmagstat.errorfloatnullableJ/ApJ/755/20/table2Inferred physical parameters from SED fits to YSOsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDYSO identification (1)meta.id;meta.maincharNNumber of observations for this YSO (table 1) within 0.5arcsecmeta.numberintnullableRAJ2000[109/109.2] Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-9.5/-9.3] Declination (J2000)degpos.eq.dec;meta.mainM[0.6/8.8] Stellar masssolMassphys.massfloate_M[0.1/2] Mass uncertaintysolMassstat.errorfloatT[3.4/16.1] Stellar temperaturekKphys.temperaturefloate_T[0.1/5] Temperature uncertaintykKstat.errorfloatAge[0.04/8.1] Stellar age (t*)Myrtime.agefloate_Age[0.04/3.3] Age uncertaintyMyrstat.error;time.agefloatMdisk[0/0.2] Disk masssolMassphys.massfloate_Mdisk[0/0.3] Mdisk uncertaintysolMassstat.errorfloatdM/dt[0/390] Disk accretion rate (dM/dt_disk_)1e-08solMass.yr**-1arith.ratefloate_dM/dt[0/383] dM/dt uncertainty1e-08solMass.yr**-1stat.errorfloatAv[3.1/23.7] Foreground visual absorptionmagphys.absorption;em.opt.Vfloate_Av[0.1/6.7] Av uncertaintymagstat.errorfloatchi2[0.8/35.9] Best fit {chi}^2^_min_stat.fit.chi2;meta.modelledfloatSimbadSimbad column added by the CDSmeta.ref.urlchar