J/ApJS/202/19ivo://CDS.VizieR/J/ApJS/202/19doi:10.26093/cds/vizier.22020019CDSGuarcello M.G.Wright N.J.Drake J.J.Garcia-Alvarez D.Drew J.E.,Aldcroft T.Kashyap V.L.2019-03-08T16:03:39Z2012-11-16T09:08:00ZCDS support team

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

cds-question@unistra.frstellar-associationspre-main-sequence-starsinfrared-photometryvisible-astronomyWide-band photometryIn order to fully understand the gravitational collapse of molecular clouds, the star formation process, and the evolution of circumstellar disks, these phenomena must be studied in different Galactic environments with a range of stellar contents and positions in the Galaxy. The young massive association Cygnus OB2, in the Cygnus-X region, is a unique target to study how star formation and the evolution of circumstellar disks proceed in the presence of a large number of massive stars. We present a catalog obtained with recent optical observations in the r, i, z filters with OSIRIS, mounted on the 10.4m Gran Telescopio CANARIAS telescope, which is the deepest optical catalog of CygOB2 to date. The catalog consists of 64,157 sources down to M=0.15M_{sun}_ at the adopted distance and age of Cyg OB2. A total of 38,300 sources have good photometry in all three bands. We combined the optical catalog with existing X-ray data of this region, in order to define the cluster locus in the optical diagrams. The cluster locus in the r-i versus i-z diagram is compatible with an extinction of the optically selected cluster members in the 2.64m<A_V_<5.57m range. We derive an extinction map of the region, finding a median value of A_V_=4.33m in the center of the association, decreasing toward the northwest. In the color-magnitude diagrams, the shape of the distribution of main-sequence stars is compatible with the presence of an obscuring cloud in the foreground ~850+/-25pc from the Sun.2012ApJS..202...19Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/202/19CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/107/1433 : Cygnus OB2 polarimetry (Kobulnicky+, 1994)J/A+AS/111/407 : VI Cygni red + reddened stars (Parthasarathy+, 1995)J/MNRAS/298/753 : Variables in Cygnus OB2 (Pigulski+ 1998)J/ApJS/149/123 : WSRT survey of Cygnus OB2 (Setia Gunawan+, 2003)J/ApJ/643/238 : Chandra/2MASS sources in Cygnus OB2 (Butt+, 2006)J/A+A/464/211 : Chandra and near-IR obs. of Cyg OB2 (Albacete Colombo+, 2007)J/A+A/472/557 : Cygnus OB2 region 610MHz sources (Marti+, 2007)J/A+A/474/495 : Cygnus OB2 young stars X-ray flares (Albacete Colombo+, 2008)J/A+A/486/453 : NIR photometry of early-type stars in CygOB2 (Comeron+, 2008)J/ApJS/184/84 : X-ray sources in Cyg OB2 region (Wright+, 2009)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/ApJ/713/871 : Sources in Cyg-OB2 from X-ray (Wright+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/202/19https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/202/19http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/202/19https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/202/19https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/202/19http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/202/19GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/202/19/cygob2 (Final OSIRIS catalog of Cyg OB2 (table3 of paper))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/202/19/cygob2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/202/19/cygob2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/202/19/cygob2?GETtext/xml+votable180.050000true308.639923141.48510360.0055555555555555566/14670 14692 14693 19456https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/202/19?format=asciiOpticalInfrareddefaultJ/ApJS/202/19/cygob2Final OSIRIS catalog of Cyg OB2 (table3 of paper)ID[1/64157] Sequential source IDmeta.id;meta.mainintprimaryRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination (J2000)degpos.eq.dec;meta.mainindexedrmag? Magnitude in r band in the AB systemmagphot.mag;em.opt.Rfloatnullablee_rmag? Error associated with r magnitudemagstat.error;phot.mag;em.opt.Rfloatnullableimag? Magnitude in i band in the AB systemmagphot.mag;em.opt.Ifloatnullablee_imag? Associated with i magnitudemagstat.error;phot.mag;em.opt.Ifloatnullablezmag? Magnitude in z band in the AB systemmagphot.mag;em.opt.Ifloatnullablee_zmag? Error associated with z magnitudemagstat.error;phot.mag;em.opt.Ifloatnullablechi{chi}^2^ from the PSF fitting (1)stat.fit.chi2floatSharpSharp parameter describing the stellar profile (1)stat.fit.paramfloat