J/AJ/148/122ivo://CDS.VizieR/J/AJ/148/122doi:10.26093/cds/vizier.51480122CDSGunther H.M.Cody A.M.Covey K.R.Hillenbrand L.A.Plavchan P.,Poppenhaeger K.Rebull L.M.Stauffer J.R.Wolk S.J.Allen L.Bayo A.,Gutermuth R.A.Hora J.L.Meng H.Y.A.Morales-Calderon M.Parks J.R.,Song I.2019-08-06T12:09:25Z2015-03-16T06:52:44ZCDS support team

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

cds-question@unistra.frmolecular-cloudsyoung-stellar-objectsvariable-starsinfrared-photometryThe emission from young stellar objects (YSOs) in the mid-infrared (mid-IR) is dominated by the inner rim of their circumstellar disks. We present IR data from the Young Stellar Object VARiability (YSOVAR) survey of ~800 objects in the direction of the Lynds 1688 (L1688) star-forming region over four visibility windows spanning 1.6yr using the Spitzer Space Telescope in its warm mission phase. Among all light curves, 57 sources are cluster members identified based on their spectral energy distribution and X-ray emission. Almost all cluster members show significant variability. The amplitude of the variability is larger in more embedded YSOs. Ten out of 57 cluster members have periodic variations in the light curves with periods typically between three and seven days, but even for those sources, significant variability in addition to the periodic signal can be seen. No period is stable over 1.6yr. Nonperiodic light curves often still show a preferred timescale of variability that is longer for more embedded sources. About half of all sources exhibit redder colors in a fainter state. This is compatible with time-variable absorption toward the YSO. The other half becomes bluer when fainter. These colors can only be explained with significant changes in the structure of the inner disk. No relation between mid-IR variability and stellar effective temperature or X-ray spectrum is found.2014AJ....148..122Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/148/122CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)II/289 : JKH photometry in LDN 1688 (Wilking+, 2008)II/332 : c2d Spitzer final data release (DR4) (Evans+, 2003)J/ApJS/211/3 : NIR photometry variability in {rho} Oph (Parks+, 2014)J/ApJ/753/149 : YSOVAR: 6 eclipsing binaries in Orion (Morales-Calderon+, 2012)J/AJ/142/140 : Optical spectroscopy of {rho} Oph stars. II. (Erickson+, 2011)J/ApJ/733/50 : Mid-IR photometry in the ONC (Morales-Calderon+, 2011)J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)J/ApJ/566/993 : Lynds 1688 cluster NICMOS imaging (Allen+, 2002)http://sha.ipac.caltech.edu/applications/Spitzer/SHA : Spitzer Heritage Archivehttp://cda.harvard.edu/chaser/ : Chandra Data Archivehttp://github.com/YSOVAR : YSOVAR custom routines in Pythonhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/148/122https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/148/122http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/148/122https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/148/122https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/148/122http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/148/122GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/148/122/table2 (Source designations, flux densities, and light curve properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/148/122/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/148/122/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/148/122/table2?GETtext/xml+votable180.050000true246.64984-24.349640.005555555555555556Cone search capability for table J/AJ/148/122/table5 (New members for L1688 in addition to the YSOVAR standard member set and Wilking et al. 2008 (cat. II/289))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/148/122/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/148/122/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/148/122/table5?GETtext/xml+votable180.050000true246.88244-24.799780.0055555555555555566/429816.772611666688002e-21 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/148/122?format=asciiInfrareddefaultJ/AJ/148/122/table1Observation logrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAORSpitzer Astronomical Observation Request (AOR) identification number (1)meta.id;obsintObs0Starting UT date of the observationstime.start;obsnullableObs1Ending UT date of the observationstime.end;obsnullableJ/AJ/148/122/table2Source designations, flux densities, and light curve propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainNameObject name (1)meta.id;meta.maincharprimaryMmeta.ref.urlcharSSTYSVIAU designation in the Spitzer Space Telescope YSOVAR survey (JHHMMSS.ss+DDMMSS.s) (2)meta.idcharONameOther object identifier(s)meta.idcharSSTc2dIdentifier in the Spitzer Space Telescope c2d project (JHHMMSS.S+DDMMSS) (3)meta.idcharW+08[40/258]? Identifier in Wilking et al. 2008 (cat. II/289)meta.idintnullableAOC08Identifier in Alves de Oliveira & Casali 2008 (cat. J/A+A/485/155) (JHHMMSS.ss+HHMMSS.s)meta.idcharUKIDSS? UKIDSS object identifier (4)meta.idnullableJmag[9.4/17.6]? The 2MASS J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? Uncertainty in Jmagmagstat.error;phot.mag;em.IR.Jfloatnullabler_JmagData reference source for Jmag (5)meta.ref;phot.mag;em.IR.JcharHmag[8.6/16.9]? The 2MASS H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? Uncertainty in Hmagmagstat.error;phot.mag;em.IR.Hfloatnullabler_HmagData reference source for Hmag (5)meta.ref;phot.mag;em.IR.HcharKmag[7.8/15.5]? The 2MASS Ks band magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? Uncertainty in Kmagmagstat.error;phot.mag;em.IR.Kfloatnullabler_KmagData reference source for Kmag (5)meta.ref;phot.mag;em.IR.Kchar[3.6][6.4/17.9]? Spitzer/IRAC 3.6{mu}m band magnitudemagphot.mag;em.IR.3-4umfloatnullablee_[3.6]? Uncertainty in [3.6]magstat.error;phot.mag;em.IR.3-4umfloatnullabler_[3.6]Data reference source for [3.6] (5)meta.ref;phot.mag;em.IR.3-4umchar[4.5][5/17.4]? Spitzer/IRAC 4.5{mu}m band magnitudemagphot.mag;em.IR.4-8umfloatnullablee_[4.5]? Uncertainty in 4.5magmagstat.error;phot.mag;em.IR.4-8umfloatnullabler_[4.5]Data reference source for [4.5] (5)meta.ref;phot.mag;em.IR.4-8umchar[5.8][3.8/15.6]? Spitzer/IRAC 5.8{mu}m band magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_[5.8]? Uncertainty in [5.8]magstat.error;phot.flux.density;em.IR.4-8umfloatnullabler_[5.8]Data reference source for [5.8] (5)meta.ref;phot.flux.density;em.IR.4-8umchar[8.0][2.6/14.9]? Spitzer/IRAC 8{mu}m band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0]? Uncertainty in [8.0]magstat.error;phot.flux.density;em.IR.8-15umfloatnullabler_[8.0]Data reference source for [8.0] (5)meta.ref;phot.flux.density;em.IR.8-15umchar[24][0.5/10.3]? Spitzer/MIPS 24um band magnitude (6)magphot.flux.density;em.IR.15-30umfloatnullablee_[24]? Uncertainty in [24]magstat.error;phot.flux.density;em.IR.15-30umfloatnullabler_[24]Data reference source for [24] (5)meta.ref;phot.flux.density;em.IR.15-30umcharCl1Infrared (IR) class according to Spectral Energy Distribution (SED) slope in all visibility windows (F, I, II, or III) (G1)meta.code.class;em.IRcharCl2IR class according to SED slope in visibility window 1 only (F, I, II, or III) (G1)meta.code.class;em.IRcharMmCluster membership according to YSOVAR standard (False or True)meta.code.membercharStdSource in YSOVAR standard set? (False or True) (7)meta.codecharN36Number of data points in the 3.6{mu}m band (for first visibility window only) (1)ctmeta.number;em.IR.3-4umintN45Number of data points in the 4.5{mu}m band (for first visibility window only) (1)ctmeta.number;em.IR.4-8umintM36? Maximum of 3.6{mu}m band magnitude in light curve (for first visibility window) (1)magstat.max;phot.mag;em.IR.3-4umfloatnullablem36? Minimum of 3.6{mu}m band magnitude in light curve (for first visibility window only) (1)magstat.min;phot.mag;em.IR.3-4umfloatnullableM45? Maximum of 4.5{mu}m band magnitude in light curve (for first visibility window only) (1)magstat.max;phot.mag;em.IR.4-8umfloatnullablem45? Minimum of 4.5{mu}m band magnitude in light curve (for first visibility window only) (1)magstat.min;phot.mag;em.IR.4-8umfloatnullable<[36]>? Mean Spitzer/IRAC 3.6{mu}m band magnitude (for first visibility window only) (1)magphot.mag;em.IR.3-4umfloatnullablee_<[36]>? Standard deviation in <[36]> (8)magstat.stdev;phot.mag;em.IR.3-4umfloatnullableW36? Width of Spitzer/IRAC 3.6{mu}m band (for first visibility window only) (9)maginstr.bandwidth;obs;em.IR.3-4umfloatnullable<[45]>? Mean Spitzer/IRAC 4.5{mu}m band magnitude (for first visibility window only) (1)magphot.mag;em.IR.4-8umfloatnullablee_<[45]>? Standard deviation in <[45]> (8)magstat.stdev;phot.mag;em.IR.4-8umfloatnullableW45? Width of Spitzer/IRAC 4.5{mu}m band (for first visibility window only) (9)maginstr.bandwidth;obs;em.IR.4-8umfloatnullablechi36? Reduced {chi}^2^ to mean 3.6{mu}m band (for first visibility window only) (1)stat.fit.chi2;em.IR.3-4umfloatnullablechi45? Reduced {chi}^2^ to mean 4.5{mu}m band (for first visibility window only) (1)stat.fit.chi2;em.IR.4-8umfloatnullablet36? Decay time of 3.6{mu}m band AutoCorrelation Function (ACF) (for first visibility window only) (1)dtime;em.IR.3-4umfloatnullablet45? Decay time of 4.5{mu}m band ACF (for first visibility window only) (1)dtime;em.IR.4-8umfloatnullableStet1? Stetson index for 3.6 and 4.5{mu}m band light curves (for first visibility window only) (1)spect.index;em.IRfloatnullableCMD1? Angle of best-fit line in Color-Magnitude Diagram (CMD) for 3.6 and 4.5{mu}m bands (in first visibility window only) (1)radstat.fit.paramfloatnullablee_CMD1? Uncertainty in CMD1radstat.errorfloatnullableN3.6Number of data points in entire 3.6{mu}m band light curve (1)ctmeta.number;em.IR.3-4umintN4.5Number of data points in entire 4.5{mu}m band light curve (1)ctmeta.number;em.IR.4-8umintM3.6? Maximum magnitude in entire 3.6{mu}m band light curve (1)magstat.max;phot.mag;em.IR.3-4umfloatnullablem3.6? Minimum magnitude in entire 3.6{mu}m band light curve (1)magstat.min;phot.mag;em.IR.3-4umfloatnullableM4.5? Maximum magnitude in entire 4.5{mu}m band light curve (1)magstat.max;phot.mag;em.IR.4-8umfloatnullablem4.5? Minimum magnitude in entire 4.5{mu}m band light curve (1)magstat.min;phot.mag;em.IR.4-8umfloatnullable<[3.6]>? Mean magnitude in entire Spitzer/IRAC 3.6{mu}m band light curve (1)magphot.mag;em.IR.3-4umfloatnullablee_<[3.6]>? Standard deviation in <[3.6]> (8)magstat.stdev;phot.mag;em.IR.3-4umdoublenullableW3.6? Width of entire Spitzer/IRAC 3.6{mu}m band light curve (9)magphot.mag;em.IR.3-4umfloatnullable<[4.5]>? Mean magnitude in entire Spitzer/IRAC 4.5{mu}m band light curve (1)magphot.mag;em.IR.4-8umfloatnullablee_<[4.5]>? Standard deviation in <[4.5]> (8)magstat.stdev;phot.mag;em.IR.4-8umdoublenullableW4.5? Width of entire Spitzer/IRAC 4.5{mu}m band light curve (9)maginstr.bandwidth;obs;em.IR.4-8umfloatnullablechi3.6? Reduced {chi}^2^ to mean of entire 3.6{mu}m band light curve (1)stat.fit.chi2;em.IR.3-4umfloatnullablechi4.5? Reduced {chi}^2^ to mean of entire 4.5{mu}m band light curve (1)stat.fit.chi2;em.IR.4-8umfloatnullableStet? Stetson index for entire 3.6 and 4.5{mu}m band light curves (1)spect.index;em.IRfloatnullableCMD? Angle of best-fit line in CMD for entire 3.6 and 4.5{mu}m band light curves (1)radstat.fit.paramfloatnullablee_CMD? Uncertainty in CMDradstat.errorfloatnullableTeff[0/5040]? Effective temperature from literatureKphys.temperature.effectiveintnullabler_TeffReference for Teff (5)meta.ref;pos.framecharXrChandra counterpart? (False or True)meta.codecharG+09Display the data from Gutermuth et al. 2009 (cat. J/ApJS/184/18) within 5''meta.ref.urlintnullableJ/AJ/148/122/table4Periodic sources in the fast-cadence datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharChannelIRAC channel: [3.6], [4.5], or [3.6]-[4.5] (1)instr.bandpasscharPer[2.2/14.5] Perioddtime.periodfloatProb[0/1] False-alarm probabilitystat.probabilityfloatClObserved SED class using the light curves from visibility window 1 (G1)src.classcharJ/AJ/148/122/table5New members for L1688 in addition to the YSOVAR standard member set and Wilking et al. 2008 (cat. II/289)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainNameObject namemeta.id;meta.maincharClSED class (G1)src.classchar