J/ApJ/733/113ivo://CDS.VizieR/J/ApJ/733/113doi:10.26093/cds/vizier.17330113CDSRoccatagliata V.Bouwman J.Henning T.Gennaro M.Feigelson E.,Kim J.S.Sicilia-Aguilar A.Lawson W.A.2017-06-26T11:49:12Z2012-12-12T09:43:32ZCDS support team

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

cds-question@unistra.fryoung-stellar-objectsstellar-associationsinfrared-photometryx-ray-sourcesWe present a deep Spitzer/Infrared Array Camera (IRAC) survey of the OB association IC 1795 carried out to investigate the evolution of protoplanetary disks in regions of massive star formation. Combining Spitzer/IRAC data with Chandra/Advanced CCD Imaging Spectrometer observations, we find 289 cluster members. An additional 340 sources with an infrared excess, but without X-ray counterpart, are classified as cluster member candidates. Both surveys are complete down to stellar masses of about 1M_{sun}_. We present pre-main-sequence isochrones computed for the first time in the Spitzer/IRAC colors. The age of the cluster, determined via the location of the Class III sources in the [3.6]-[4.5]/[3.6] color-magnitude diagram, is in the range of 3-5Myr. As theoretically expected, we do not find any systematic variation in the spatial distribution of disks within 0.6pc of either O-type star in the association. However, the disk fraction in IC 1795 does depend on the stellar mass: sources with masses >2M_{sun}_ have a disk fraction of ~20%, while lower mass objects (2-0.8M_{sun}_) have a disk fraction of ~50%. This implies that disks around massive stars have a shorter dissipation timescale.2011ApJ...733..113Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/733/113CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2012)II/297 : AKARI/IRC mid-IR all-sky Survey (ISAS/JAXA, 2010)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/A+A/514/A2 : AKARI/HIP and AKARI/2MASS samples (Ita+, 2010)J/A+A/501/539 : RMS survey. 6cm observations of YSOs (Urquhart+, 2009)J/ApJ/660/1532 : Spitzer/IRAC-MIPS survey of NGC 2244 (Balog+, 2007)J/ApJ/654/338 : Spitzer photometry in W3 molecular cloud (Ruch+, 2007)J/AJ/129/393 : UBV photometry in W3 (Oey+, 2005)J/AJ/126/1423 : MSX 8.3um fluxes of star-forming regions (Kraemer+, 2003)J/A+AS/124/205 : W3 star-forming region 345 GHz survey (Helmich+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/733/113https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/733/113http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/733/113https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/733/113https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/733/113http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/733/113GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/733/113/x-ir (Spitzer/IRAC sources with Chandra counterparts)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/733/113/x-ir?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/733/113/x-ir?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/733/113/x-ir?GETtext/xml+votable180.050000true36.4741861162.021216940.005555555555555556Cone search capability for table J/ApJ/733/113/members (Cluster member candidates: IRAC sources, with excess, without X-ray counterpart)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/733/113/members?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/733/113/members?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/733/113/members?GETtext/xml+votable180.050000true36.7513769462.0914150.0055555555555555566/36492.0616683193919197e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/733/113?format=asciiX-rayInfrareddefaultJ/ApJ/733/113/x-irSpitzer/IRAC sources with Chandra counterpartsExc[X~-] Infrared excess code (2)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification; IRAC- (HHMMSSss+DDMMSSs)meta.id;meta.maincharf_IDFlag on source (1)meta.codecharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.maine_RAJ2000Error in RAdeg0.0001degstat.error;pos.eq.rafloatDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.maine_DEJ2000Error in DEdeg0.0001degstat.error;pos.eq.decfloatFV? V band flux density (3)mJyphot.flux.density;em.opt.VfloatnullableFI? I band flux density (3)mJyphot.flux.density;em.opt.IfloatnullableFJ? 2MASS J band flux density (4)mJyphot.flux.density;em.IR.JdoublenullableFH? 2MASS H band flux density (4)mJyphot.flux.density;em.IR.HfloatnullableFK? 2MASS Ks band flux density (4)mJyphot.mag;em.IR.KdoublenullableF3.6? Spitzer/IRAC 3.6 micron band flux densitymJyphot.mag;em.IR.3-4umdoublenullablee_F3.6? Uncertainty in F3.6 (5)mJystat.errorfloatnullableF4.5? Spitzer/IRAC 4.5 micron band flux densitymJyphot.mag;em.IR.4-8umdoublenullablee_F4.5? Uncertainty in F4.5 (5)mJystat.errorfloatnullableF5.8? Spitzer/IRAC 5.8 micron band flux densitymJyphot.flux.density;em.IR.4-8umdoublenullablee_F5.8? Uncertainty in F5.8 (5)mJystat.errorfloatnullableF8.0? Spitzer/IRAC 8.0 micron band flux densitymJyphot.flux.density;em.IR.8-15umdoublenullablee_F8.0? Uncertainty in F8.0 (5)mJystat.errorfloatnullable2MDisplay the 2MASS data (Cat. II/246) within 3"meta.ref.urlcharSimbadSimbad column added by the CDSmeta.refcharDiskDisk classification (only for table 2)meta.code.class;src.classcharJ/ApJ/733/113/membersCluster member candidates: IRAC sources, with excess, without X-ray counterpartrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification; IRAC- (HHMMSSss+DDMMSSs)meta.id;meta.maincharf_IDFlag on source (1)meta.codecharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.maine_RAJ2000Error in RAdeg0.0001degstat.error;pos.eq.rafloatDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.maine_DEJ2000Error in DEdeg0.0001degstat.error;pos.eq.decfloatFV? V band flux density (3)mJyphot.flux.density;em.opt.VfloatnullableFI? I band flux density (3)mJyphot.flux.density;em.opt.IfloatnullableFJ? 2MASS J band flux density (4)mJyphot.flux.density;em.IR.JdoublenullableFH? 2MASS H band flux density (4)mJyphot.flux.density;em.IR.HfloatnullableFK? 2MASS Ks band flux density (4)mJyphot.mag;em.IR.KdoublenullableF3.6? Spitzer/IRAC 3.6 micron band flux densitymJyphot.mag;em.IR.3-4umdoublenullablee_F3.6? Uncertainty in F3.6 (5)mJystat.errorfloatnullableF4.5? Spitzer/IRAC 4.5 micron band flux densitymJyphot.mag;em.IR.4-8umdoublenullablee_F4.5? Uncertainty in F4.5 (5)mJystat.errorfloatnullableF5.8? Spitzer/IRAC 5.8 micron band flux densitymJyphot.flux.density;em.IR.4-8umdoublenullablee_F5.8? Uncertainty in F5.8 (5)mJystat.errorfloatnullableF8.0? Spitzer/IRAC 8.0 micron band flux densitymJyphot.flux.density;em.IR.8-15umdoublenullablee_F8.0? Uncertainty in F8.0 (5)mJystat.errorfloatnullableSimbadSimbad column added by the CDSmeta.refchar