J/ApJ/697/787ivo://CDS.VizieR/J/ApJ/697/787doi:10.26093/cds/vizier.16970787CDSGuieu S.Rebull L.M.Stauffer J.R.Hillenbrand L.A.Carpenter J.M.,Noriega-Crespo A.Padgett D.L.Cole D.M.Carey S.J.Stapelfeldt K.R.,Strom S.E.2011-06-08T12:58:35Z2011-05-18T11:41:12ZCDS support team

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

cds-question@unistra.fryoung-stellar-objectsinfrared-photometrynebulaevisible-astronomyphotometryWe present a 9deg^2^ map of the North American and Pelican Nebulae regions obtained in all four Infrared Array Camera (IRAC) channels with the Spitzer Space Telescope. The resulting photometry is merged with that at JHKs from Two Micron All Sky Survey and a more spatially limited BVI survey from previous ground-based work. We use a mixture of color-color diagrams to select a minimally contaminated set of more than 1600 objects that we claim are young stellar objects (YSOs) associated with the star-forming region. Because our selection technique uses infrared excess as a requirement, our sample is strongly biased against inclusion of Class III YSOs. The distribution of IRAC spectral slopes for our YSOs indicates that most of these objects are Class II, with a peak toward steeper spectral slopes but a substantial contribution from a tail of Flat spectrum and Class I type objects. By studying the small fraction of the sample that is optically visible, we infer a typical age of a few Myr for the low-mass population. The young stars are clustered, with about a third of them located in eight clusters that are located within or near the LDN 935 dark cloud. Half of the YSOs are located in regions with surface densities higher than 1000YSOs/deg^2^. The Class I objects are more clustered than the Class II stars.2009ApJ...697..787Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/697/787CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/196 : Vilnius Photometry in two Nebulae (Straizys et al., 1993)J/ApJS/193/25 : The NAN complex. II. MIPS observations (Rebull+, 2011)J/BaltA/18/141 : North America/Pelican red clump giants ugriJHK (Straizys+,J/BaltA/17/1 : Infrared photometry in GL490 star-forming region (Straizys+J/BaltA/17/125 : Interstellar reddening in 3 HII regions (Straizys+, 2008)J/BaltA/15/483 : Vilnius photometry in LDN 935 (Laugalys+, 2006)J/A+A/419/149 : UBV(I)c photometry of NGC 6996 (Villanova+, 2004)J/A+AS/104/557 : uvby-beta photometry in star-forming regions (Terranegra+https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/697/787https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/697/787http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/697/787https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/697/787https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/697/787http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/697/787GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/697/787/table4 (Table of YSO candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/697/787/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/697/787/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/697/787/table4?GETtext/xml+votable180.050000true311.8229666743.797180280.0055555555555555565/3840 3842 6/14679 14684 14685 14687 15366 15372 153926.772611666688002e-21 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/697/787?format=asciiOpticalInfrareddefaultJ/ApJ/697/787/table4Table of YSO candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[GRS2009]The IAU designation \dicS{[GRS2009] SST JHHMMSS.s+DDMMSS.s} in Simbad)meta.id;meta.mainchar2MASSThe 2MASS designation (HHMMSSss+DDMMSSs) \linkRole{2MASS data (Cutri et al. 2003, Cat. II/246)} (1)meta.id.crosscharBmag? The KPNO B band magnitudemagphot.mag;em.opt.BfloatnullableVmag? The KPNO V band magnitudemagphot.mag;em.opt.VfloatnullableImag? The KPNO I band magnitudemagphot.mag;em.opt.IfloatnullableJmag? 2MASS J band magnitudemagphot.mag;em.IR.JfloatnullableHmag? 2MASS J band magnitudemagphot.mag;em.IR.HfloatnullableKsmag? 2MASS Ks band magnitudemagphot.mag;em.IR.Kfloatnullable[3.6]? Spitzer/IRAC 3.6 micron band magnitudemagphot.mag;em.IR.3-4umfloatnullable[4.5]? Spitzer/IRAC 4.5 micron band magnitudemagphot.mag;em.IR.4-8umfloatnullable[5.8]? Spitzer/IRAC 5.8 micron band magnitudemagphot.flux.density;em.IR.4-8umfloatnullable[8.0]? Spitzer/IRAC 8.0 micron band magnitudemagphot.flux.density;em.IR.8-15umfloatnullable[24]? Spitzer/MIPS 24 micron band magnitudemagphot.flux.density;em.IR.15-30umfloatnullableRGS2011Display the data from Paper II (Rebull et al. 2011, Cat. J/ApJS/193/25)meta.ref.urlcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.main