J/AJ/144/192ivo://CDS.VizieR/J/AJ/144/192doi:10.26093/cds/vizier.51440192CDSMegeath S.T.Gutermuth R.Muzerolle J.Kryukova E.Flaherty K.,Hora J.L.Allen L.E.Hartmann L.Myers P.C.Pipher J.L.Stauffer J.,Young E.T.Fazio G.G.2017-12-06T07:38:21Z2014-02-03T12:40:47ZCDS support team

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

cds-question@unistra.frmolecular-cloudsyoung-stellar-objectsinfrared-photometrypre-main-sequence-starsWe present a survey of the Orion A and B molecular clouds undertaken with the IRAC and MIPS instruments on board Spitzer. In total, five distinct fields were mapped, covering 9deg^2^ in five mid-IR bands spanning 3-24{mu}m. The survey includes the Orion Nebula Cluster, the Lynds 1641, 1630, and 1622 dark clouds, and the NGC 2023, 2024, 2068, and 2071 nebulae. These data are merged with the Two Micron All Sky Survey point source catalog to generate a catalog of eight-band photometry. We identify 3479 dusty young stellar objects (YSOs) in the Orion molecular clouds by searching for point sources with mid-IR colors indicative of reprocessed light from dusty disks or infalling envelopes. The YSOs are subsequently classified on the basis of their mid-IR colors and their spatial distributions are presented. We classify 2991 of the YSOs as pre-main-sequence stars with disks and 488 as likely protostars. Most of the sources were observed with IRAC in two to three epochs over six months; we search for variability between the epochs by looking for correlated variability in the 3.6 and 4.5{mu}m bands. We find that 50% of the dusty YSOs show variability. The variations are typically small (~0.2mag) with the protostars showing a higher incidence of variability and larger variations. The observed correlations between the 3.6, 4.5, 5.8, and 8{mu}m variability suggests that we are observing variations in the heating of the inner disk due to changes in the accretion luminosity or rotating accretion hot spots.2012AJ....144..192Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/144/192CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/MNRAS/429/775 : X-ray and mid-IR study of NGC 2023 (Lopez-Garcia+, 2013)J/ApJS/207/5 : YSOs in LDN 1641 with Hectochelle spectra (Fang+, 2013)J/AJ/144/31 : Spitzer+2MASS phot. of protostar candidates (Kryukova+, 2012)J/ApJ/733/50 : Mid-IR photometry of ONC (Morales-Calderon+, 2011)J/A+A/507/1485 : Young (proto)stellar population in L1630 (Mookerjea+ 2009)J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)J/AJ/137/4072 : Infrared photometry of G216-2.5 YSOs (Megeath+, 2009)J/A+A/504/461 : YSOs in L1630N and L1641 (Fang+, 2009)J/AJ/135/966 : Circumstellar disk evolution in NGC 2068/71 (Flaherty+, 2008)J/ApJ/674/336 : Spitzer observations of NGC 1333 (Gutermuth+, 2008)J/AJ/135/966 : Circumstellar disk evolution in NGC 2068/71 (Flaherty+, 2008)J/ApJ/676/1109 : Stars velocities in the Orion Nebula Cluster (Furesz+, 2008)J/ApJ/669/493 : Spitzer/Chandra YSOs in Serpens cloud core (Winston+, 2007)J/ApJ/646/1215 : Low-mass stars and brown dwarfs in NGC 2024 (Levine+, 2006)J/AJ/126/1665 : NICMOS observations of NGC 2024 (Liu+, 2003)J/ApJ/598/375 : Chandra X-ray observations of NGC 2024 (Skinner+, 2003)J/ApJ/581/325 : NGC 2071 water masers (Seth+, 2002)J/A+A/372/L41 : NGC 2068/2071 protoclusters (Motte+, 2001)J/AJ/116/1816 : JHKLMNOPQ photometry in Orion cluster (Hillenbrand+, 1998)J/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/144/192https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/144/192http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/144/192https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/144/192https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/144/192http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/144/192GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/144/192/table4 (Spitzer-identified Young Stellar Objects (YSOs): IRAC, MIPS, and 2MASS magnitudes)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/144/192/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/144/192/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/144/192/table4?GETtext/xml+votable180.050000true85.6778333-10.419250.0055555555555555566/21400 21402 21403 21406 21425 21427 21428 21430 21433 21435 21436 21438 21439 22804 22805 22807 22848 22850 22854 22855 22861 22866 22867 22869 22872 22873 22876 22878 235606.772611666688002e-21 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/144/192?format=asciiInfrareddefaultJ/AJ/144/192/table4Spitzer-identified Young Stellar Objects (YSOs): IRAC, MIPS, and 2MASS magnitudes[8.0]? Spitzer/IRAC 8.0 micron band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0]? Uncertainty in [8.0] (1)magstat.errorfloatnullable[24]? Spitzer/MIPS 24 micron band magnitudemagphot.flux.density;em.IR.15-30umfloatnullablee_[24]? Uncertainty in [24] (1)magstat.errorfloatnullableAKs? Extinction in the Ks band (2)phys.absorptionfloatnullablealpha? IRAC spectral index ({alpha}_IRAC_) (3)spect.indexfloatnullableClSource classification (D, P, FP or RP) (4)src.classchar2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/3479] Running sequence numbermeta.id;meta.mainintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainJmag? 2MASS J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? Uncertainty in Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag? 2MASS H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? Uncertainty in Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKmag? 2MASS Ks band magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? Uncertainty in Kmagmagstat.error;phot.mag;em.IR.Kfloatnullable[3.6]? Spitzer/IRAC 3.6 micron band magnitudemagphot.mag;em.IR.3-4umfloatnullablee_[3.6]? Uncertainty in [3.6] (1)magstat.errorfloatnullable[4.5]? Spitzer/IRAC 4.5 micron band magnitudemagphot.mag;em.IR.4-8umfloatnullablee_[4.5]? Uncertainty in [4.5] (1)magstat.errorfloatnullable[5.8]? Spitzer/IRAC 5.8 micron band magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_[5.8]? Uncertainty in [5.8] (1)magstat.errorfloatnullable