J/ApJ/722/1226ivo://CDS.VizieR/J/ApJ/722/1226doi:10.26093/cds/vizier.17221226CDSHernandez J.Morales-Calderon M.Calvet N.Hartmann L.Muzerolle J.,Gutermuth R.Luhman K.L.Stauffer J.2017-10-11T05:13:42Z2012-08-09T10:03:22ZCDS support team

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

cds-question@unistra.frinfrared-photometryradial-velocityyoung-stellar-objectsopen-star-clustersWe present IRAC/MIPS Spitzer Space Telescope observations of the solar-type and the low-mass stellar population of the young (~5Myr) {lambda} Orionis cluster. Combining optical and Two Micron All Sky Survey photometry, we identify 436 stars as probable members of the cluster. Given the distance (450pc) and the age of the cluster, our sample ranges in mass from 2M_{sun}_ to objects below the substellar limit. With the addition of the Spitzer mid-infrared data, we have identified 49 stars bearing disks in the stellar cluster. Using spectral energy distribution slopes, we place objects in several classes: non-excess stars (diskless), stars with optically thick disks, stars with "evolved disks" (with smaller excesses than optically thick disk systems), and "transitional disk" candidates (in which the inner disk is partially or fully cleared). The disk fraction depends on the stellar mass, ranging from ~6% for K-type stars (R_C_-J<2) to ~27% for stars with spectral-type M5 or later (R_C_-J>4). We confirm the dependence of disk fraction on stellar mass in this age range found in other studies. Regarding clustering levels, the overall fraction of disks in the {lambda} Orionis cluster is similar to those reported in other stellar groups with ages normally quoted as ~5Myr.2010ApJ...722.1226Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/722/1226CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/A+A/536/A63 : Collinder 69 very low mass stars (Bayo+, 2011)J/A+A/530/A150 : XMM obervations of {lambda} Ori cluster (Franciosini+, 2011)J/A+A/526/A21 : Collinder 69 X-ray sources (Barrado+, 2011)J/A+A/488/167 : Low-mass stars in {sigma} Ori and {lambda} Ori (Sacco+, 2008)J/MNRAS/385/2210 : Spectroscopy around lam Ori and sig Ori (Maxted+, 2008)J/A+A/492/277 : Analysis of Collinder 69 stars with VOSA (Bayo+, 2008)J/ApJ/664/481 : Photometry of Collinder 69 (Barrado y Navascues+ 2007)J/ApJ/610/1064 : Substellar population of lam Ori (Barrado y Navascues+, 2004)J/AJ/123/387 : VRI photometry of lam Ori star-forming region (Dolan+, 2002)J/AJ/121/2124 : {lambda} Ori pre-main-sequence stars photometry (Dolan+, 2001)J/AJ/118/2409 : VRI photometry of {lambda} Ori PMS stars (Dolan+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/722/1226https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/722/1226http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/722/1226https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/722/1226https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/722/1226http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/722/1226GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/722/1226/table1 (Compiled membership information of the {lambda} Orionis Cluster)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/722/1226/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/722/1226/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/722/1226/table1?GETtext/xml+votable180.050000true83.431139.756360.005555555555555556Cone search capability for table J/ApJ/722/1226/table2 (Photometric candidates of the {lambda} Orionis Cluster)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/722/1226/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/722/1226/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/722/1226/table2?GETtext/xml+votable180.050000true83.301029.579580.005555555555555556Cone search capability for table J/ApJ/722/1226/table3 (Additional sources with infrared excesses)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/722/1226/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/722/1226/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/722/1226/table3?GETtext/xml+votable180.050000true83.341610.033870.0055555555555555566/23695 23717 23719 23728 237306.772611666688002e-21 6.185923063528282e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/722/1226?format=asciiOpticalInfrareddefaultJ/ApJ/722/1226/table1Compiled membership information of the {lambda} Orionis ClusterSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[936/7971] Identification numbermeta.id;meta.mainintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainNameSource name (LOriNNN, see ref. 2 or DMNN, see ref. 1)meta.idcharSpTypeMK spectral typesrc.spTypecharr_SpTypeReference(s) for SpType (1)meta.ref;pos.framecharRV1? Radial velocity 1km/sspect.dopplerVelocfloatnullableRV2? Radial velocity 2km/sspect.dopplerVelocfloatnullableRV3? Radial velocity 3km/sspect.dopplerVelocfloatnullabler_RVReference(s) for radial velocities (1)meta.ref;pos.framecharLiILi I present? (Y according to r_LiI)meta.codecharr_LiIReference(s) for LiI (1)meta.ref;pos.framecharMembMembership details (G1)meta.code.membercharMmMembership flag (2)meta.code.errorcharXccross-match with other {lambda} Orionis catalogs within 1"meta.ref.urlintnullable2MDisplay the 2MASS data within 1.5" (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharJ/ApJ/722/1226/table2Photometric candidates of the {lambda} Orionis ClusterrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[30/7968] Identification numbermeta.id;meta.mainintprimary2MASS2MASS identification numbermeta.idcharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.main[3.6]Spitzer/IRAC 3.6 micron band magnitudemagphot.mag;em.IR.3-4umfloate_[3.6]Uncertainty in [3.6]magstat.errorfloat[4.5]Spitzer/IRAC 4.5 micron band magnitudemagphot.mag;em.IR.4-8umfloate_[4.5]Uncertainty in [4.5]magstat.errorfloat[5.8]? Spitzer/IRAC 5.8 micron band magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_[5.8]? Uncertainty in [5.8]magstat.errorfloatnullable[8.0]? Spitzer/IRAC 8.0 micron band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0]? Uncertainty in [8.0]magstat.errorfloatnullableF24? Spitzer/MIPS 24 micron flux densitymJyphot.flux.density;em.IR.15-30umfloatnullablee_F24? Uncertainty in F24mJystat.errorfloatnullableDTypeDisk type (1)src.classcharf_DTypeFlag(s) on DType (2)meta.codecharMembMembership details (G1)meta.code.membercharMdetails of membership information (table 1)meta.ref.urlchar2MDisplay the 2MASS data within 1.5" (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharJ/ApJ/722/1226/table3Additional sources with infrared excessesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[241/7615] Identification numbermeta.id;meta.mainint2MASS2MASS identification (HHMMSSss+DDMMSSs)meta.idcharRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.main[3.6]Spitzer/IRAC 3.6um band magnitudemagphot.mag;em.IR.3-4umfloate_[3.6]Uncertainty in [3.6]magstat.errorfloat[4.5]Spitzer/IRAC 4.5um band magnitudemagphot.mag;em.IR.4-8umfloate_[4.5]Uncertainty in [4.5]magstat.errorfloat[5.8]Spitzer/IRAC 5.8um band magnitudemagphot.flux.density;em.IR.4-8umfloate_[5.8]Uncertainty in [5.8]magstat.errorfloat[8.0]Spitzer/IRAC 8.0um band magnitudemagphot.flux.density;em.IR.8-15umfloate_[8.0]Uncertainty in [8.0]magstat.errorfloatF24Spitzer/MIPS 24um flux densitymJyphot.flux.density;em.IR.15-30umfloate_F24F24 uncertaintymJystat.errorfloatCommComment (Galaxy or Stellar?)meta.notechar2MDisplay the 2MASS data within 1.5" (Cutri et al. 2003, Cat. II/246)meta.ref.urlchar