J/AJ/163/263ivo://CDS.VizieR/J/AJ/163/263doi:10.26093/cds/vizier.51630263CDSHillenbrand L.A.Kiker T.J.Gee M.Lester O.Braunfeld N.L.,Rebull L.M.Kuhn M.A.2022-11-09T06:07:19Z2022-10-11T07:35:40ZCDS support team

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

cds-question@unistra.fryoung-stellar-objectspre-main-sequence-starsinfrared-photometryvisible-astronomyphotometryWe present a study of 323 photometrically variable young stellar objects that are likely members of the North America and Pelican nebulae star-forming region. To do so, we utilize over two years of data in the g and r photometric bands from the Zwicky Transient Facility. We first investigate periodic variability, finding 46 objects (~15% of the sample) with significant periods that phase well and can be attributed to stellar rotation. We then use the quasiperiodicity (Q) and flux asymmetry (M) variability metrics to assign morphological classifications to the remaining aperiodic light curves. Another ~39% of the variable star sample beyond the periodic (low Q) sources are also flux-symmetric, but with a quasiperiodic (moderate Q) or stochastic (high Q) nature. Concerning flux-asymmetric sources, our analysis reveals ~14% bursters (high negative M) and ~29% dippers (high positive M). We also investigate the relationship between variability slopes in the g versus g-r color-magnitude diagram, and the light-curve morphological classes. Burster-type objects have shallow slopes, while dipper-type variables tend to have higher slopes that are consistent with extinction-driven variability. Our work is one of the earliest applications of the Q and M metrics to ground-based data. We therefore contrast the Q values of high-cadence and high-precision space-based data, for which these metrics were designed, with Q determinations resulting from degraded space-based light curves that have the cadence and photometric precision characteristic of ground-based data.2022AJ....163..263Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/163/263CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/gcvs : General Catalogue of Variable Stars (Samus+, 2007-2017)I/345 : Gaia DR2 (Gaia Collaboration, 2018)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)J/AJ/121/3160 : JHK photometry near the Trapezium region (Carpenter+, 2001)J/A+A/396/513 : Stellar Rotation in the Orion Nebula Cluster (Herbst+, 2002)J/ApJ/697/787 : The NAN complex. I. IRAC observations (Guieu+, 2009)J/A+A/520/A15 : RACE-OC project; YSOs within 100pc (Messina+, 2010)J/ApJ/733/50 : Mid-IR photo. monitoring of the ONC (Morales-Calderon+, 2011)J/ApJS/193/25 : The NAN complex. II. MIPS observations (Rebull+, 2011)J/AJ/147/82 : Monitoring of disk-bearing stars in NGC 2264 (Cody+, 2014)J/AJ/148/122 : YSOVAR; infrared photometry in Lynds 1688 (Gunther+, 2014)J/A+A/568/A49 : Long-term photometry of pre-MS stars (Poljancic Beljan+, 2014)J/other/PASA/32.21 : Long-Term Multicolour Photometry of YSOs (Ibryamov+, 2015)J/AJ/150/118 : YSOVAR IR photometry in IRAS 20050+2720 (Poppenhaeger+, 2015)J/AJ/150/145 : YSOVAR infrared photometry in GGD12-15 (Wolk+, 2015)J/A+A/602/A115 : X-ray survey of NGC7000/IC5070 (Damiani+, 2017)J/ApJ/848/97 : Young stellar variables with KELT for K2 I. (Rodriguez+, 2017)J/AJ/156/71 : K2 Campaign 2 young disk-bearing stars Sco & Oph (Cody+, 2018)J/other/RAA/18.137 : Long-term BVRI photometry 15 PMS stars (Ibryamov+, 2018)J/AJ/156/275 : Rotational evolution young, binary M dwarfs (Stauffer+, 2018)J/A+A/627/A135 : VRI photometry of IC5070 variable stars (Bhardwaj+, 2019)J/ApJ/886/152 : ZTF early observations of Type Ia SNe. I. LCs (Yao+, 2019)J/ApJ/902/48 : ZTF early observations type Ia supernovae. III. (Bulla+, 2020)J/ApJ/904/140 : Ruprecht 147 members & rot. data 5 other cl. (Curtis+, 2020)J/ApJ/904/146 : Young stars in North America & Pelican Nebulae (Fang+, 2020)J/ApJ/899/128 : Validated & new members NGC7000/IC5070 Complex (Kuhn+, 2020)J/ApJ/902/47 : ZTF early obs. of type Ia SNe. II. Rise time (Miller+, 2020)J/AJ/159/198 : Cataclysmic variables in ZTF 1yr (2018-2019) (Szkody+, 2020)J/AJ/161/15 : Light curve of the dwarf nova AT 2020iko (Soraisam+, 2021)J/AJ/162/101 : K2 ugri & H{alpha} photometry in Lagoon Nebula (Venuti+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/163/263https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/163/263http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/163/263https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/163/263https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/163/263http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/163/263GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/163/263/table2 (Properties of variable stars in our NAP sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/163/263/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/163/263/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/163/263/table2?GETtext/xml+votable180.050000true311.7700743.819840.0055555555555555566/14679 14685-14687 15360 15362-15363 15368-15370https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/163/263?format=asciiOpticalInfrareddefaultJ/AJ/163/263/table2Properties of variable stars in our NAP samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIdentifier (1)meta.id;meta.maincharRAICRS[311/316] ICRS Right Ascension, decimal degrees (2)degpos.eq.ra;meta.mainDEICRS[42/46] ICRS Declination, decimal degrees (2)degpos.eq.dec;meta.mainTscale[0.83/236]? Timescale or Period, days (3)dtime.scalefloatnullableQ[0.11/1] lightcurve quasiperiodicity metric defined in Equation 2meta.code;src.varfloatM[-1.2/1.11] lightcurve asymmetry metric defined in Equation 3meta.code;src.varfloatnu[0.004/0.12] variability metric, Equation 1 (4)meta.code;src.varfloatrmag[12.4/19.4] mean magnitude over ZTF time seriesmagphot.mag;em.opt.RfloatPriPrimary variability class (5)meta.code.class;src.varcharSecSecondary variability class (5)meta.code.class;src.varcharCMDang[7.5/98.4]? Fitted slope to the g vs g-r color-magnitude diagram (6)degstat.fit.residualfloatnullable