J/ApJ/706/896ivo://CDS.VizieR/J/ApJ/706/896doi:10.26093/cds/vizier.17060896CDSMookerjea B.Sandell G.2026-05-19T14:25:37Z2012-01-12T09:36:31ZCDS support team

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

cds-question@unistra.frinfrared-photometrymolecular-cloudsh-ii-regionspre-main-sequence-starsWe investigate the young stellar population in and near the cometary globule Ori I-2. The analysis is based on deep Nordic Optical Telescope R-band and H{alpha} images, JCMT SCUBA 450 and 850um images combined with near-infrared Two Micron All Sky Survey (2MASS) photometry and mid-infrared archival Spitzer images obtained with the Infrared Array Camera (IRAC; 3.6, 4.5, 5.8, and 8um), and MIPS (24 and 70um) instruments. We identify a total of 125 sources within the 5'x5' region imaged by the IRAC. Of these sources, 87 are detected in the R-band image and 51 are detected in the 2MASS. Ori I-2 shows clear evidence of triggered star formation with four young low-luminosity pre-main-sequence (PMS) stars embedded in the globule. At least two, possibly as many as four, additional low-mass PMS objects were discovered in the field which are probably part of the young {sigma} Orionis cluster. Among the PMS stars which have formed in the globule, MIR-54 is a young, deeply embedded Class 0/I object; MIR-51 and 52 are young Class II sources, while MIR-89 is a more evolved, heavily extincted Class II object with its apparent colors mimicking a Class 0/I object. The Class 0/I object MIR-54 coincides with a previously known IRAS source and is a strong submillimeter source. It is most likely the source for the molecular outflow and the large parsec-scale Herbig-Haro (HH) flow. However, the nearby Class II source, MIR-52, which is strong a H{alpha} emission line star, also appears to drive an outflow approximately aligned with the outflow from MIR-54, and because of the proximity of the two outflows, either star could contribute. MIR-89 appears to excite a low-excitation HH object, HH 992, discovered for the first time in this study.2009ApJ...706..896Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/706/896CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/A+A/510/A1 : Near infrared imaging of cometary globule CG12 (Haikala+,J/A+A/507/1485 : Young (proto)stellar population in L1630 (Mookerjea+ 2009)J/ApJS/175/277 : Submillimeter-Continuum SCUBA detections (Di Francesco+,J/ApJ/674/336 : Spitzer observations of NGC 1333 (Gutermuth+, 2008)J/AJ/135/2323 : H{alpha} stars and HH objects near BRCs (Ikeda+, 2008)J/ApJ/669/327 : S3MC: YSOs in N66, in SMC (Simon+, 2007)J/MNRAS/276/57 : IRAS Galactic star-forming regions. II. (Codella+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/706/896https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/706/896http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/706/896https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/706/896https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/706/896http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/706/896GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/706/896/table1 (Mid infrared sources in Ori I-2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/706/896/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/706/896/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/706/896/table1?GETtext/xml+votable180.050000true84.4804167-1.72755560.0055555555555555566/228606.772611666688002e-21 3.3785437584409506e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/706/896?format=asciiInfrareddefaultJ/ApJ/706/896/table1Mid infrared sources in Ori I-2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_MIR[*] *: candidate pre-main sequence star further discussed in text and table 3meta.notecharMIR[1-125] Ori I-2 MIR source number (<[MS2009c] MIR-NNN> in Simbad)meta.id;meta.mainintRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainf_Rmag[S] S: saturated; Flag for MIR-73 (1)meta.codecharRmag? Nordic Optical Telescope R-band magnitudemagphot.mag;em.opt.RfloatnullableJmag? 2MASS J-band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? Jmag uncertaintymagstat.error;phot.mag;em.IR.JfloatnullableHmag? 2MASS H-band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? Hmag uncertaintymagstat.error;phot.mag;em.IR.HfloatnullableKsmag? 2MASS Ks-band magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag? Ksmag uncertaintymagstat.error;phot.mag;em.IR.KfloatnullableF3.6? Spitzer/IRAC 3.6um band fluxmJyphot.mag;em.IR.3-4umfloatnullablef_F3.6[ab] Near the edge or outside 3.6um map (2)meta.codechare_F3.6? F3.6 uncertaintymJystat.errorfloatnullableF4.5? Spitzer/IRAC 4.5um band fluxmJyphot.mag;em.IR.4-8umfloatnullablee_F4.5? F4.5 uncertaintymJystat.errorfloatnullableF5.8? Spitzer/IRAC 5.8um band fluxmJyphot.flux.density;em.IR.4-8umfloatnullablef_F5.8[a] outside the 5.8um map (2)meta.codechare_F5.8? F5.8 uncertaintymJystat.errorfloatnullableF8.0? Spitzer/IRAC 8.0um band fluxmJyphot.flux.density;em.IR.8-15umfloatnullablee_F8.0? F8.0 uncertaintymJystat.errorfloatnullableF24? Spitzer/MIPS 24um band fluxmJyphot.flux.density;em.IR.15-30umfloatnullablee_F24? F24 uncertaintymJystat.errorfloatnullable2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlchar