J/ApJ/733/50ivo://CDS.VizieR/J/ApJ/733/50doi:10.26093/cds/vizier.17330050CDSMorales-Calderon M.Stauffer J.R.Hillenbrand L.A.Gutermuth R.,Song I.Rebull L.M.Plavchan P.Carpenter J.M.Whitney B.A.Covey K.,de Oliveira C.A.Winston E.McCaughrean M.J.Bouvier J.Guieu S.,Vrba F.J.Holtzman J.Marchis F.Hora J.L.Wasserman L.H.Terebey S.,Megeath T.Guinan E.Forbrich J.Huelamo N.Riviere-Marichalar P.,Barrado D.Stapelfeldt K.Hernandez J.Allen L.E.Ardila D.R.Bayo A.,Favata F.James D.Werner M.Wood K.2017-10-12T13:00:48Z2012-12-07T13:50:12ZCDS support team

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

cds-question@unistra.fropen-star-clustersinfrared-photometryyoung-stellar-objectsvariable-starsWe present initial results from time-series imaging at infrared wavelengths of 0.9deg^2^ in the Orion Nebula Cluster (ONC). During Fall 2009 we obtained 81 epochs of Spitzer 3.6 and 4.5um data over 40 consecutive days. We extracted light curves with ~3% photometric accuracy for ~2000 ONC members ranging from several solar masses down to well below the hydrogen-burning mass limit. For many of the stars, we also have time-series photometry obtained at optical (Ic) and/or near-infrared (JKs) wavelengths. Our data set can be mined to determine stellar rotation periods, identify new pre-main-sequence eclipsing binaries, search for new substellar Orion members, and help better determine the frequency of circumstellar disks as a function of stellar mass in the ONC. Our primary focus is the unique ability of 3.6 and 4.5um variability information to improve our understanding of inner disk processes and structure in the Class I and II young stellar objects (YSOs). In this paper, we provide a brief overview of the YSOVAR Orion data obtained in Fall 2009 and highlight our light curves for AA-Tau analogs -YSOs with narrow dips in flux, most probably due to disk density structures passing through our line of sight. Detailed follow-up observations are needed in order to better quantify the nature of the obscuring bodies and what this implies for the structure of the inner disks of YSOs.2011ApJ...733...50Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/733/50CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/142/60 : Palomar Transient Factory Orion Project (Van Eyken+, 2011)J/AJ/139/950 : JHKs photometry in ONC (Robberto+, 2010)J/A+A/515/A13 : Very low mass objects in ONC (Rodriguez-Ledesma+, 2010)J/ApJ/676/1109 : Velocities of stars in the ONC (Furesz+, 2008)J/ApJ/671/605 : NGC 2264 and ONC PMS stars in the infrared (Cieza+, 2007)J/ApJS/160/353 : Membership of the Orion nebula population (Getman+, 2005)http://ysovar.ipac.caltech.edu/ : YSOVAR project websitehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/733/50https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/733/50http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/733/50https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/733/50https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/733/50http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/733/50GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/733/50/stars (The ONC stars sample (table added by CDS with coordinates from table 2 in the published version))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/733/50/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/733/50/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/733/50/stars?GETtext/xml+votable180.050000true83.8862686-4.83664890.0055555555555555566/21438 21439 22804 22805https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/733/50?format=asciiInfrareddefaultJ/ApJ/733/50/table2Time series at the [3.6] and [4.5] IRAC bands for the ONC starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintISOYObject identification (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharMJD[55127.4/55166.7] Modified Julian date of the observationdtime.epochdoubleBand[IRAC1/IRAC2] Spitzer/IRAC band (IRAC1=3.6um or IRAC2=4.5um)meta.code;instr.filtercharmag[5.073/16.645] Observed magnitude in Bandmagphot.magfloate_magError in magmagstat.error;phot.magfloatJ/ApJ/733/50/starsThe ONC stars sample (table added by CDS with coordinates from table 2 in the published version)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintISOYObject identification (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharprimaryRAJ2000[83.5/84.1] Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000[-6.1/-4.6] Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainLCShow the light curvesmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.refchar