J/ApJ/759/48ivo://CDS.VizieR/J/ApJ/759/48doi:10.26093/cds/vizier.17590048CDSMallick K.K.Ojha D.K.Samal M.R.Pandey A.K.Bhatt B.C.Ghosh S.K.,Dewangan L.K.Tamura M.2017-12-07T07:27:01Z2014-08-13T15:09:45ZCDS support team

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

cds-question@unistra.frh-ii-regionsinfrared-photometryvisible-astronomyphotometryWe present a multiwavelength study of the Galactic H II region Sh2-297, located in the Canis Major OB1 complex. Optical spectroscopic observations are used to constrain the spectral type of ionizing star HD 53623 as B0V. The classical nature of this H II region is affirmed by the low values of electron density and emission measure, which are calculated to be 756/cm3 and 9.15x10^5^cm^-6^pc using the radio continuum observations at 610 and 1280MHz, and Very Large Array archival data at 1420MHz. To understand local star formation, we identified the young stellar object (YSO) candidates in a region of area ~7.5'x7.5' centered on Sh2-297 using grism slitless spectroscopy (to identify the H{alpha} emission line stars), and near infrared (NIR) observations. NIR YSO candidates are further classified into various evolutionary stages using color-color and color-magnitude (CM) diagrams, giving 50 red sources (H-K>0.6) and 26 Class II-like sources. The mass and age range of the YSOs are estimated to be ~0.1-2M_{sun}_ and 0.5-2Myr using optical (V/V-I) and NIR (J/J-H) CM diagrams. The mean age of the YSOs is found to be ~1Myr, which is of the order of dynamical age of 1.07Myr of the H II region. Using the estimated range of visual extinction (1.1-25mag) from literature and NIR data for the region, spectral energy distribution models have been implemented for selected YSOs which show masses and ages to be consistent with estimated values. The spatial distribution of YSOs shows an evolutionary sequence, suggesting triggered star formation in the region. The star formation seems to have propagated from the ionizing star toward the cold dark cloud LDN1657A located west of Sh2-297.2012ApJ...759...48Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/759/48CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/311 : WISE All-Sky Data Release (Cutri+ 2012)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)III/195 : Atlas of Optical Spectral Classification OB Stars (Walborn+ 1990)VII/20 : Catalogue of HII Regions (Sharpless 1959)J/A+A/527/A88 : Chemistry in infrared dark clouds (Vasyunina+, 2011)J/ApJS/175/277 : Submillimeter-Continuum SCUBA detections (Di Francesco+, 2008)J/PASJ/56/313 : 13CO survey of Mon + CMa molecular clouds (Kim+, 2004)J/A+A/404/223 : 2MASS IR star clusters in the Galaxy (Bica+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/759/48https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/759/48http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/759/48https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/759/48https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/759/48http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/759/48GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/759/48/table2 (Optical and infrared magnitudes for the YSOs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/759/48/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/759/48/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/759/48/table2?GETtext/xml+votable180.050000true106.24179167-12.280777780.005555555555555556Cone search capability for table J/ApJ/759/48/table3 (SED results for the YSOs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/759/48/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/759/48/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/759/48/table3?GETtext/xml+votable180.050000true106.24179167-12.280777780.0055555555555555566/216411.3088508223161842e-20 3.9395800315085955e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/759/48?format=asciiOpticalInfrareddefaultJ/ApJ/759/48/table2Optical and infrared magnitudes for the YSOse_W3mag[0.02/0.1]? W3mag uncertaintymagstat.error;phot.magfloatnullableSetSample (G1)src.samplecharSeq[1/97] Running sequence number (<[MOS2012] NN> in Simbad)meta.id;meta.mainintprimaryPSimbad column added by the CDSmeta.ref.urlcharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainVmag[13.86/20.78]? HCT Bessell V-band magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag[0.01/0.14]? Vmag uncertaintymagstat.error;phot.mag;em.opt.VfloatnullableImag[12.69/17.95]? HCT Bessell I-band magnitudemagphot.mag;em.opt.Ifloatnullablee_Imag[0.01/0.03]? Imag uncertaintymagstat.error;phot.mag;em.opt.IfloatnullableJmag[11.67/18.25]? J-band (1.25um) magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag[0.01/0.1]? Jmag uncertaintymagstat.error;phot.mag;em.IR.JfloatnullableHmag[10.83/18.02]? H-band (1.63um) magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag[0.01/0.1]? Hmag uncertaintymagstat.error;phot.mag;em.IR.HfloatnullableKsmag[10.07/16.21]? Ks-band (2.14um) magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag[0.01/0.14]? Ksmag uncertaintymagstat.error;phot.mag;em.IR.KfloatnullableW1mag[9.61/15.72]? WISE W1-band (3.4um) magnitudemagphot.mag;em.IR.3-4umfloatnullablee_W1mag[0.01/0.27]? W1mag uncertaintymagstat.error;phot.magfloatnullableW2mag[9.03/14.33]? WISE W2-band (4.6um) magnitudemagphot.mag;em.IR.4-8umfloatnullablee_W2mag[0.01/0.27]? W2mag uncertaintymagstat.error;phot.magfloatnullableW3mag[5.12/10]? WISE W3-band (12um) magnitudemagphot.flux.density;em.IR.8-15umfloatnullableJ/ApJ/759/48/table3SED results for the YSOsSetSample (G1)src.samplecharSeq[1/96] Identification numbermeta.id;meta.mainintRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainM*[0.1/4.6] Stellar masssolMassphys.massfloate_M*[0.1/2.3] Mass uncertaintysolMassstat.errorfloatlogt*[3.3/6.7] Stellar agelog(yr)time.agefloate_logt*[0.07/1.3] logt* uncertaintylog(yr)stat.errorfloatlogT[3.4/4.2] log of Temperaturelog(K)phys.temperaturefloate_logT[0.01/0.3] logT uncertaintylog(K)stat.errorfloatdM/dt[-12.9/-6.3] Disk accretion ratelog(solMass.yr**-1)arith.ratefloate_dM/dt[0.5/3] dM/dt uncertaintylog(solMass.yr**-1)stat.errorfloatAv[1.3/16.3] Foreground visual extinction (A_V_)magphys.absorption;em.opt.Vfloate_Av[0.2/8] Av uncertaintymagstat.errorfloatchi2[0.03/8.3] {chi}^2^_min_ per data point of the best fitarith.zp;meta.modelledfloat