J/ApJ/703/1964ivo://CDS.VizieR/J/ApJ/703/1964doi:10.26093/cds/vizier.17031964CDSFurlan E.Watson D.M.McClure M.K.Manoj P.Espaillat C.D'Alessio P.,Calvet N.Kim K.H.Sargent B.A.Forrest W.J.Hartmann L.2017-07-11T13:08:14Z2011-12-07T11:48:24ZCDS support team

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

cds-question@unistra.frmolecular-cloudsinfrared-astronomyspectroscopyyoung-stellar-objectsWe analyze samples of Spitzer Infrared Spectrograph spectra of T Tauri stars in the Ophiuchus, Taurus, and Chamaeleon I star-forming regions, whose median ages lie in the <1-2Myr range. The median mid-infrared spectra of objects in these three regions are similar in shape, suggesting, on average, similar disk structures. When normalized to the same stellar luminosity, the medians follow each other closely, implying comparable mid-infrared excess emission from the circumstellar disks. We use the spectral index between 13 and 31um and the equivalent width of the 10um silicate emission feature to identify objects whose disk configuration departs from that of a continuous, optically thick accretion disk. Based on their medians and fraction of evolved disks, T Tauri stars in Taurus and Chamaeleon I are very alike.2009ApJ...703.1964Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/703/1964CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/156 : IRAS Faint Source Catalog, |b| > 10, Version 2.0 (Moshir+ 1989)V/73 : Emission-Line Stars of the Orion Population (Herbig+ 1988)J/A+A/519/A34 : YSOs in DROXO (Deep rho Oph XMM obs.) (Pillitteri+, 2010)J/A+A/515/A75 : Low-mass population in {rho} Oph cloud (Alves de Oliveira+,J/ApJ/692/973 : Protostars in Perseus, Serpens and Ophiuchus (Enoch+, 2009)J/PASJ/60/209 : Faint companions around YSOs in TMC (Itoh+, 2008)J/ApJ/683/822 : Star formation in Ophiuchus and Perseus II. (Jorgensen+, 2008)J/ApJS/173/104 : Stellar population in Chamaeleon I (Luhman, 2007)J/A+A/452/245 : Near-IR photometry of PMS stars in rho Oph (Natta+, 2006)J/A+A/460/695 : Search for Associations Containing Young stars (Torres+, 2006)J/AJ/130/1733 : Optical spectroscopy of {rho} Oph stars (Wilking+, 2005)J/AJ/126/2971 : UBVRI photometry of 131 Herbig Ae/Be (Vieira+, 2003)J/A+A/372/173 : ISOCAM observations of the rho Ophiuchi cloud (Bontemps+,J/A+A/357/219 : ISOCAM observations in Cha I. (Persi+, 2000)J/ApJS/112/109 : Rho Oph Near-IR Positions and Photometry (Barsony+, 1997)J/ApJS/101/117 : UBVRIJHKLMNQ photometry in Taurus-Auriga (Kenyon+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/703/1964https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/703/1964http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/703/1964https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/703/1964https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/703/1964http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/703/1964GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/703/1964/targets (Properties of the targets in the Ophiuchus core , in the Taurus , in the Chamaeleon I or in the Ophiuchus off-core region and their coordinates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/703/1964/targets?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/703/1964/targets?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/703/1964/targets?GETtext/xml+votable180.050000true63.489083329.30536110.0055555555555555565/270 292 6/342 1029 1031 1037 1039 1040 1048 1050 1051 1052 1053 1054 1063 1073 1074 1075 1111 1114 1115 1123 1124 1136 1156 1159 1176 1179 23548 23549 23551 24201 24203 24299 24300 36956 36957 36958 37122 37128 42958 42970 42980 42981 42983 42988 42989 42994 44356https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/703/1964?format=asciiInfrareddefaultJ/ApJ/703/1964/table6aOphiuchus core median (H normalization)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength in micronumem.wlfloatnuFnuMedian flux density {nu}F_{nu}_ (1)mW.m**-2phot.fluxdoublee_nuFnuLower quartile in nuFnu (1)mW.m**-2stat.errordoubleE_nuFnuUpper quartile in nuFnu (1)mW.m**-2stat.error;stat.maxdoubleJ/ApJ/703/1964/targetsProperties of the targets in the Ophiuchus core , in the Taurus , in the Chamaeleon I or in the Ophiuchus off-core region and their coordinatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameTarget namemeta.id;meta.maincharLocSimbad column added by the CDSmeta.codecharSpTAdopted MK spectral type (1)src.spTypecharAv? Optical extinction A_V_ (assuming R_V_=3.1) (2)phys.absorption;em.optfloatnullableEW? The 10um equivalent width in umumspect.line.eqWidth;em.IR.8-15umfloatnullablen13-31? The 13-31um spectral index (n_13-31_)spect.indexfloatnullableMed[x]? x: the object was used in the median calculationmeta.codecharRAJ2000Hour of Right Ascension (J2000) (3)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainSimbadNameSimbad column added by the CDSmeta.idcharJ/ApJ/703/1964/table6bChamaeleon I median (H normalization)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength in micronumem.wlfloatnuFnuMedian flux density {nu}F_{nu}_ (1)mW.m**-2phot.fluxdoublee_nuFnuLower quartile in nuFnu (1)mW.m**-2stat.errordoubleE_nuFnuUpper quartile in nuFnu (1)mW.m**-2stat.error;stat.maxdoubleJ/ApJ/703/1964/table6cTaurus median (H normalization)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength in micronumem.wlfloatnuFnuMedian flux density {nu}F_{nu}_ (1)mW.m**-2phot.fluxdoublee_nuFnuLower quartile in nuFnu (1)mW.m**-2stat.errordoubleE_nuFnuUpper quartile in nuFnu (1)mW.m**-2stat.error;stat.maxdouble