J/MNRAS/494/458ivo://CDS.VizieR/J/MNRAS/494/458doi:10.26093/cds/vizier.74940458CDSZivkov V.Oliveira J.M.Petr-Gotzens M.G.Rubele S.Cioni M.-R.L.,van Loon J.T.de Grijs R.Emerson J.Ivanov V.D.Marconi M.,Moretti M.I.Ripepi V.Niederhofer F.Sun N.-C.2024-08-21T20:14:14Z2020-12-17T10:40:21ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsvariable-starsphotometryStudies of young stellar objects (YSOs) in the Galaxy have found that a significant fraction exhibits photometric variability. However, no systematic investigation has been conducted on the variability of extragalactic YSOs. Here we present the first variability study of massive YSOs in an ~1.5 square degree region of the Large Magellanic Cloud (LMC). The aim is to investigate whether the different environmental conditions in the metal-poor LMC (~0.4-0.5Z_{sun}_) have an impact on the variability characteristics. Multi-epoch near-infrared (NIR) photometry was obtained from the VISTA Survey of the Magellanic Clouds (VMC) and our own monitoring campaign using the VISTA telescope. By applying a reduced {Chi}-square-analysis, stellar variability was identified. We found 3062 candidate variable stars from a population of 362425 stars detected. Based on several Spitzer studies, we compiled a sample of high-reliability massive YSOs: a total of 173 massive YSOs have NIR counterparts (down to Ks~18.5mag) in the VMC catalogue, of which 39 display significant (>3{sigma}) variability. They have been classified as eruptive, fader, dipper, short-term variable, and long-period variable YSOs based mostly on the appearance of their Ks-band light curves. The majority of YSOs are aperiodic; only five YSOs exhibit periodic light curves. The observed amplitudes are comparable or smaller than those for Galactic YSOs (only two Magellanic YSOs exhibit {Delta}Ks>1mag), not what would have been expected from the typically larger mass accretion rates observed in the Magellanic Clouds.2020MNRAS.494..458Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/494/458CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/351 : VISTA Magellanic Survey (VMC) catalog (Cioni+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/494/458https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/494/458http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/494/458https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/494/458https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/494/458http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/494/458GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/494/458/tablea3 (Properties of the LMC 7_5 variables)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/494/458/tablea3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/494/458/tablea3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/494/458/tablea3?GETtext/xml+votable180.050000true82.838401794-67.3631134030.0055555555555555565/8275 6/33099 331127.952274030004205e-20 1.0188844282367877e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/494/458?format=asciidefaultJ/MNRAS/494/458/tablea3Properties of the LMC 7_5 variablesSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDCatalogue IDmeta.id;meta.mainintRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainYmag? Apparent magnitude in Y filtermagphot.mag;em.IR.JfloatnullableJmag? Apparent magnitude in J filtermagphot.mag;em.IR.JfloatnullableKsmag? Apparent magnitude in Ks filtermagphot.mag;em.IR.KfloatnullableVarBandsBand(s) in which the variability was identifiedmeta.notecharJamp? Observed amplitude in J filtermagsrc.var.amplitudedoublenullableKsamp? Observed amplitude in Ks filtermagsrc.var.amplitude;em.IR.KdoublenullableVarType? Type of variable according to OGLE database (1)meta.notechar