J/ApJ/773/135ivo://CDS.VizieR/J/ApJ/773/135doi:10.26093/cds/vizier.17730135CDSGuarcello M.G.Drake J.J.Wright N.J.Drew J.E.Gutermuth R.A.,Hora J.L.Naylor T.Aldcroft T.Fruscione A.Garcia-alvarez D.,Kashyap V.L.King R.2014-12-16T11:15:31Z2013-08-22T14:01:37ZCDS support team

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

cds-question@unistra.frstellar-associationspre-main-sequence-starsphotometryThe formation of stars in massive clusters is one of the main modes of the star formation process. However, the study of massive star-forming regions is hampered by their typically large distances to the Sun. One exception to this is the massive star-forming region Cygnus OB2 in the Cygnus X region, at the distance of ~1400pc. Cygnus OB2 hosts very rich populations of massive and low-mass stars, being the best target in our Galaxy to study the formation of stars, circumstellar disks, and planets in the presence of massive stars. In this paper, we combine a wide and deep set of photometric data, from the r band to 24{mu}m, in order to select the disk-bearing population of stars in Cygnus OB2 and identify the class I, class II, and stars with transition and pre-transition disks. We selected 1843 sources with infrared excesses in an area of 1{deg}x1{deg} centered on Cyg OB2 in several evolutionary stages: 8.4% class I, 13.1% flat-spectrum sources, 72.9% class II, 2.3% pre-transition disks, and 3.3% transition disks. The spatial distribution of these sources shows a central cluster surrounded by an annular overdensity and some clumps of recent star formation in the outer region. Several candidate subclusters are identified, both along the overdensity and in the rest of the association.2013ApJ...773..135Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/773/135CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)II/321 : IPHAS DR2 Source Catalogue (Barentsen+, 2014)J/ApJ/643/238 : Chandra/2MASS sources in Cygnus OB2 (Butt+, 2006)J/A+A/464/211 : Cyg OB2 Chandra and near-IR obs (Albacete Colombo+, 2007)J/A+A/472/557 : Cygnus OB2 region 610MHz sources (Marti+, 2007)J/MNRAS/384/1277 : H{alpha} emission line sources from IPHAS (Witham+, 2008)J/A+A/486/453 : Early-type stars in Cyg OB2 NIR photometry (Comeron+, 2008)J/ApJS/184/84 : X-ray sources in Cyg OB2 region (Wright+, 2009)J/ApJ/713/871 : X-ray sources in star-forming region Cyg-OB2 (Wright+, 2010)J/ApJ/720/679 : Optical spectroscopy in Cygnus X region (Beerer+, 2010)J/ApJS/194/27 : Variable stars in Cygnus OB2 (Henderson+, 2011)J/A+A/543/A101 : OB stars in Cygnus OB2 association (Comeron+, 2012)J/ApJS/202/19 : GTC/OSIRIS riz photometry in Cyg OB2 (Guarcello+, 2012)http://www.iphas.org/ : IPHAS Home Pagehttp://www.sdss.org/ : SDSS Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/773/135https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/773/135http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/773/135https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/773/135https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/773/135http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/773/135GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/773/135/catalog (Catalog of candidate stars with disk)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/773/135/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/773/135/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/773/135/catalog?GETtext/xml+votable180.050000true307.757556141.12569280.0055555555555555566/14670 14671 14692 14693 146946.772611666688002e-21 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/773/135?format=asciiOpticaldefaultJ/ApJ/773/135/catalogCatalog of candidate stars with diskRAJ2000Right ascension (J2000) (1)degpos.eq.ra;meta.mainID[229/329368] Sequential star numbermeta.id;meta.mainintprimaryDEJ2000Declination (J2000) (1)degpos.eq.dec;meta.mainrmagO? OSIRIS r magnitude (see J/ApJS/202/19)magphot.mag;em.opt.Rfloatnullablee_rmagO? rms uncertainty on rmagOmagstat.error;phot.magfloatnullableimagO? OSIRIS i magnitude (see J/ApJS/202/19)magphot.mag;em.opt.Ifloatnullablee_imagO? rms uncertainty on imagOmagstat.error;phot.magfloatnullablezmagO? OSIRIS z magnitude (see J/ApJS/202/19)magphot.mag;em.opt.Ifloatnullablee_zmagO? rms uncertainty on zmagOmagstat.error;phot.magfloatnullablermagI? INT/IPHAS gR magnitudemagphot.mag;em.opt.Rfloatnullablee_rmagI? rms uncertainty on rmagImagstat.error;phot.magfloatnullableimagI? INT/IPHAS gI magnitudemagphot.mag;em.opt.Ifloatnullablee_imagI? rms uncertainty on imagImagstat.error;phot.magfloatnullableHamagI? INT/IPHAS Ha (H{alpha}) magnitudemagphot.flux;em.line.Halphafloatnullablee_HamagI? rms uncertainty on HamagImagstat.error;phot.mag;em.IR.HfloatnullableumagS? SDSS u magnitudemagphot.mag;em.opt.Ufloatnullablee_umagS? rms uncertainty on umagSmagstat.error;pos.cartesian.xfloatnullablegmagS? SDSS g magnitudemagphot.mag;em.opt.Bfloatnullablee_gmagS? rms uncertainty on gmagSmagstat.error;phot.magfloatnullablermagS? SDSS r magnitudemagphot.mag;em.opt.Rfloatnullablee_rmagS? rms uncertainty on rmagSmagstat.error;phot.magfloatnullableimagS? SDSS i magnitudemagphot.mag;em.opt.Ifloatnullablee_imagS? rms uncertainty on imagSmagstat.error;phot.magfloatnullablezmagS? SDSS z magnitudemagphot.mag;em.opt.Ifloatnullablee_zmagS? rms uncertainty on zmagSmagstat.error;phot.magfloatnullableJmag2? 2MASS J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag2? rms uncertainty on Jmag2magstat.error;phot.mag;em.IR.JfloatnullableHmag2? 2MASS H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag2? rms uncertainty on Hmag2magstat.error;phot.mag;em.IR.HfloatnullableKmag2? 2MASS Ks magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag2? rms uncertainty on Kmag2magstat.error;phot.mag;em.IR.Kfloatnullablephqualph_qual quality flag from 2MASS/PSC catalogmeta.code.qualcharrdflgrd_flg quality flag from 2MASS/PSC catalogmeta.code.qualcharblflgbl_flg quality flag from 2MASS/PSC catalogmeta.code.qualcharccflgcc_flg quality flag from 2MASS/PSC catalogmeta.code.qualcharJmagU? UKIDSS J magnitudemagphot.mag;em.IR.Jfloatnullablee_JmagU? rms uncertainty on JmagUmagstat.error;phot.mag;em.IR.JfloatnullableHmagU? UKIDSS H magnitudemagphot.mag;em.IR.Hfloatnullablee_HmagU? rms uncertainty on HmagUmagstat.error;phot.mag;em.IR.HfloatnullableKmagU? UKIDSS K magnitudemagphot.mag;em.IR.Kfloatnullablee_KmagU? rms uncertainty on KmagUmagstat.error;phot.mag;em.IR.KfloatnullableJ-KU? UKIDSS J-K colour indexmagphot.color;em.IR.J;em.IR.Kfloatnullablee_J-KU? rms uncertainty on J-KUmagstat.error;phot.color;em.IR.JfloatnullableH-KU? UKIDSS H-K colour indexmagphot.color;em.IR.H;em.IR.Kfloatnullablee_H-KU? rms uncertainty on H-KUmagstat.error;phot.color;em.IR.Hfloatnullable[3.6]? Spitzer/IRAC 3.6um magnitudemagphot.mag;em.IR.3-4umfloatnullablee_[3.6]? rms uncertainty on [3.6]magstat.errorfloatnullable[4.5]? Spitzer/IRAC 4.5um magnitudemagphot.mag;em.IR.4-8umfloatnullablee_[4.5]? rms uncertainty on [4.5]magstat.errorfloatnullable[5.8]? Spitzer/IRAC 5.8um magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_[5.8]? rms uncertainty on [5.8]magstat.errorfloatnullable[8.0]? Spitzer/IRAC 8.0um magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0]? rms uncertainty on [8.0]magstat.errorfloatnullable[24]? Spitzer/MIPS 24um magnitudemagphot.flux.density;em.IR.15-30umfloatnullablee_[24]? rms uncertainty on [24]magstat.errorfloatnullablemOI[0]? >0 if source has a multiple match between OSIRIS and IPHAS counterpartsmeta.codeintnullablemU2[0/2]? >0 if source has a multiple match between UKIDSS and 2MASS counterpartsmeta.codeintnullablemUo[0/4]? >0 if source has a multiple match between UKIDSS+2MASS and optical counterpartsmeta.codeintnullablemUS[0/3]? >0 if source has a multiple match between UKIDSS+2MASS+optical and Spitzer counterpartsmeta.codeintnullableS1[0/1] 1 if the star has been selected with the Gutermuth et al. (2009ApJS..184...18G) methodmeta.codeintS2[0/1] 1 if the star has been selected with the [4.5] versus [4.5]-[8.0] diagrammeta.codeintS3[0/1] 1 if the star has been selected with the [3.6] versus [3.6]-[24] diagrammeta.codeintS4[0/1] 1 if the star has been selected with the [24] versus [8.0]-[24] diagrammeta.codeintS5[0/1] 1 if the star has been selected with the [4.5]-[5.8] versus [5.8]-[24] diagrammeta.codeintS6[0/1] 1 if the star has been selected with the [24] versus [4.5]-[8.0] diagrammeta.codeintS7[0/1] 1 if the star has been selected with the QriJ[3.6] index (3)meta.codeintS8[0/1] 1 if the star has been selected with the QriJ[4.5] index (3)meta.codeintS9[0/1] 1 if the star has been selected with the QriJ[5.8] index (3)meta.codeintS10[0/1] 1 if the star has been selected with the QriJ[8.0] index (3)meta.codeintS11[0/1] 1 if the star has been selected with the J-H versus H-K diagrammeta.codeintS12[0/1] 1 if the star has been selected with the QJHHK index (3)meta.codeintS13[0/1] 1 if the star has been selected with the QriHK index (3)meta.codeintnS[1/13] Number of positive selection criteria ({Sigma}S_i_)meta.code.qualintalpha? Infrared spectral index {alpha} = dlog({lambda}F_{lambda}_)/dlog({lambda}).spect.index;em.IRfloatnullableClassClassification (2)src.classchar