J/AJ/150/132ivo://CDS.VizieR/J/AJ/150/132doi:10.26093/cds/vizier.51500132CDSRice T.S.Reipurth B.Wolk S.J.Vaz L.P.Cross N.J.G.2017-10-03T05:13:07Z2016-04-08T14:48:15ZCDS support team

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

cds-question@unistra.fropen-star-clustersvariable-starsinfrared-photometryUsing UKIRT on Mauna Kea, we have carried out a new near-infrared J, H, K monitoring survey of almost a square degree of the star-forming Orion Nebula Cluster with observations on 120 nights over three observing seasons, spanning a total of 894 days. We monitored ~15000 stars down to J~20 using the WFCAM instrument, and have extracted 1203 significantly variable stars from our data. By studying variability in young stellar objects (YSOs) in the H-K, K color-magnitude diagram, we are able to distinguish between physical mechanisms of variability. Many variables show color behavior indicating either dust-extinction or disk/accretion activity, but we find that when monitored for longer periods of time, a number of stars shift between these two variability mechanisms. Further, we show that the intrinsic timescale of disk/accretion variability in young stars is longer than that of dust-extinction variability. We confirm that variability amplitude is statistically correlated with evolutionary class in all bands and colors. Our investigations of these 1203 variables have revealed 73 periodic AA Tau type variables, many large-amplitude and long-period (P>15 days) YSOs, including three stars showing widely spaced periodic brightening events consistent with circumbinary disk activity, and four new eclipsing binaries. These phenomena and others indicate the activity of long-term disk/accretion variability processes taking place in young stars. We have made the light curves and associated data for these 1203 variables available online.2015AJ....150..132Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/150/132CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/768/99 : X-ray survey of YSOs in Orion A (Pillitteri+, 2013)J/ApJS/208/28 : H{alpha} survey in the ONC (Szegedi-Elek+, 2013)J/ApJS/207/10 : HST Treasury Program on the ONC (Robberto+, 2013)J/ApJ/753/149 : YSOVAR: six EBs in Orion (Morales-Calderon+, 2012)J/ApJ/748/14 : ONC population data from WFI observations (Da Rio+, 2012)J/AJ/144/192 : Orion A and B Spitzer survey. I. YSO catalog (Megeath+, 2012)J/A+A/534/A10 : HST/NICMOS III imaging in ONC (Andersen+, 2011)J/ApJ/733/50 : MIR photometric monitoring of ONC (Morales-Calderon+, 2011)J/ApJ/722/1092 : Optical photometry of the ONC. II. (Da Rio+, 2010)J/A+A/502/883 : I phot. of very low mass ONC stars (Rodriguez-Ledesma+, 2009)J/MNRAS/400/603 : New variables in ONC (Parihar+, 2009)J/ApJS/183/261 : Optical photometry of the ONC (Da Rio+, 2009)J/AJ/129/1534 : Mid-IR photometry in the Orion Nebula (Robberto+, 2005)J/ApJ/573/366 : Infrared photometry of Trapezium cluster (Muench+, 2002)J/AJ/121/3160 : JHK photometry near the Trapezium region (Carpenter+, 2001)J/ApJ/540/236 : KH photometry of Orion Nebula Cluster (Hillenbrand+, 2000)http://surveys.roe.ac.uk/wsa : WSA-WFCAM Science Archivehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/150/132https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/150/132http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/150/132https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/150/132https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/150/132http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/150/132GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/150/132/table7 (Eclipsing binaries toward M42 within WFCAM field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/150/132/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/150/132/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/150/132/table7?GETtext/xml+votable180.050000true83.5085833-5.29047220.005555555555555556Cone search capability for table J/AJ/150/132/variables (Basic (table2) and variability (tables 4 and 5) properties of 1203 variables stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/150/132/variables?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/150/132/variables?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/150/132/variables?GETtext/xml+votable180.050000true83.39127389-5.557363060.0055555555555555566/21438 21439 22804 228052.0616683193919197e-20 2.6706780932288093e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/150/132?format=asciiInfrareddefaultJ/AJ/150/132/table6Long-period periodic starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarIdentifier of the variable in the Orion Nebula Cluster (ONC) (ONCvar identifier)meta.id;meta.mainintPerPerioddtime.periodfloatLPBLong-Period Brightener (C=candidate, Y=definite identification as such)meta.codecharJ/AJ/150/132/table7Eclipsing binaries toward M42 within WFCAM fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStar? Identifier of the variable in the Orion Nebula Cluster (ONC) (ONCvar identifier)meta.idintnullableC01Display the data from Carpenter et al. 2001 (cat. J/AJ/121/3160) within 1.5''meta.ref.urlintnullableNameCommon namemeta.id;meta.mainchar2MASS2MASS identifiermeta.idcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainImag? The I band magnitude from literaturemagphot.mag;em.opt.Ifloatnullable<Jmag>The mean J band magnitude (1)magphot.mag;em.IR.Jfloat<Hmag>The mean H band magnitude (1)magphot.mag;em.IR.Hfloat<Kmag>The mean K band magnitude (1)magphot.mag;em.IR.KfloatPer? Period (2)dtime.periodfloatnullablef_Per[:?] Flag on Per (:=indicates a tentative period fit)meta.codecharRefReference (3)meta.ref;pos.framecharJ/AJ/150/132/variablesBasic (table2) and variability (tables 4 and 5) properties of 1203 variables starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStar[1/1227] Identifier of the variable in the Orion Nebula Cluster (ONC) (ONCvar identifier)meta.id;meta.mainintprimaryM12meta.ref.urlintnullableLP/EBSimbad column added by the CDSmeta.ref.urlcharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainSimbadSimbad alternative identifiermeta.idcharQ[0/2] Quality class (1)srcintP[0/1] Periodic flag (1=periodic, 0=not periodic)meta.noteintJmag[9.6/20.3]? Median UKIRT/WFCAM J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag[0.02/0.5]? Representative error in Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag[9.2/18.4]? Median UKIRT/WFCAM H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag[0.02/0.17]? Representative error in Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKmag[8.7/17.5]? Median UKIRT/WFCAM K band magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag[0.02/0.16]? Representative error in Kmagmagstat.error;phot.mag;em.IR.Kfloatnullable[3.6][5.8/16.5]? Spitzer/IRAC 3.6{mu}m band magnitudemagphot.mag;em.IR.3-4umfloatnullablee_[3.6][0/0.16]? Uncertainty in [3.6]magstat.errorfloatnullable[4.5][4.8/15.8]? Spitzer/IRAC 4.5{mu}m band magnitudemagphot.mag;em.IR.4-8umfloatnullablee_[4.5][0.001/0.13]? Uncertainty in [4.5]magstat.errorfloatnullable[5.8][3.6/14.6]? Spitzer/IRAC 5.8{mu}m band magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_[5.8][0.001/0.5]? Uncertainty in [5.8]magstat.errorfloatnullable[8.0][2.6/13.6]? Spitzer/IRAC 8.0{mu}m band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0][0.001/0.2]? Uncertainty in [8.0]magstat.errorfloatnullableClassClassification (G1)src.classcharNJ[0/328] Number of J band observations (2)meta.numberintNH[0/427] Number of H band observations (2)meta.numberintNK[0/408] Number of K band observations (2)meta.numberintDJmag[0/3]? The J band magnitude range (robust) {Delta}Jmagphot.mag;em.IR.JfloatnullableDHmag[0.04/2.5]? The H band magnitude range (robust) {Delta}Hmagphot.mag;em.IR.HfloatnullableDKmag[0.04/2]? The K band magnitude range (robust) {Delta}Kmagphot.mag;em.IR.KfloatnullableD(J-H)[0/1.9]? The (J-H) color index range (robust) {Delta}J-Hmagphot.color;em.IR.J;em.IR.HfloatnullableD(H-K)[0/1.3]? The (H-K) color index range (robust) {Delta}H-Kmagphot.color;em.IR.H;em.IR.KfloatnullableSlope1[-0.7/2]? The (J-H), (H-K) color slope m(J-H,H-K) (3)stat.correlation;phot.color;src.varfloatnullablee_Slope1[0.01/0.3]? Error in Slope1stat.errorfloatnullableSlope2[-13.7/10.3]? The J, (J-H) slope m(J,J-H) (3)stat.correlation;phot.color;src.varfloatnullablee_Slope2[0.06/6]? Error in Slope2stat.errorfloatnullableSlope3[-10.1/8.2]? The K, (H-K) slope m(K,H-K) (3)stat.correlation;phot.color;src.varfloatnullablee_Slope3[0.04/3.6]? Error in Slope3stat.errorfloatnullableS[0.9/161] Stetson variability Index (defined in Section 3.1)spect.indexfloatBand[ hjk] Bands used to compute S (J, H, or/and K)instr.bandpasscharPer[1.6/50]? Best fit period (only for the Table4)dtime.period;meta.modelledfloatnullable