J/A+A/666/A55ivo://CDS.VizieR/J/A+A/666/A55doi:10.26093/cds/vizier.36660055CDSFlaischlen S.Preibisch T.Kluge M.Manara C.F.Ercolano B.2022-10-12T12:14:20Z2022-10-05T12:01:59ZCDS support team

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

cds-question@unistra.fropen-star-clusterspre-main-sequence-starsyoung-stellar-objectsx-ray-sourcesaccretionvisible-astronomysloan-photometryThe understanding of the accretion process has a central role in the understanding of star and planet formation. We aim to test how accretion variability influences previous correlation analyses of the relation between X-ray activity and accretion rates, which is important for understanding the evolution of circumstellar disks and disk photoevaporation. We monitored accreting stars in the Orion Nebula Cluster from November 24, 2014, until February 17, 2019, for 42 epochs with the Wendelstein Wide Field Imager (WWFI) in the Sloan Digital Sky Survey u'g'r' filters on the 2m Fraunhofer Telescope on Mount Wendelstein. Mass accretion rates were determined from the measured ultraviolet excess. The influence of the mass accretion rate variability on the relation between X-ray luminosities and mass accretion rates was analyzed statistically. We find a typical interquartile range of ~0.3dex for the mass accretion rate variability on timescales from weeks to ~2-years. The variability has likely no significant influence on a correlation analysis of the X-ray luminosity and the mass accretion rate observed at different times when the sample size is large enough. The observed anticorrelation between the X-ray luminosity and the mass accretion rate predicted by models of photoevaporation-starved accretion is likely not due to a bias introduced by different observing times.2022A&A...666A..55Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/666/A55CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/139/950 : JHKs photometry in ONC (Robberto+, 2010)J/ApJ/748/14 : ONC population data from WFI observations (Da Rio+, 2012)J/AJ/150/108 : Spectroscopy and HST imaging in ONC (O'Dell+, 2015)J/A+A/648/A121 : X-ray activity and accretion in the ONC (Flaischlen+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/666/A55https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/666/A55http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/666/A55https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/666/A55https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/666/A55http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/666/A55GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/666/A55/table1 (YSOs analyzed in this study and effective temperatures, extinctions, and distances from the literature)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/666/A55/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/666/A55/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/666/A55/table1?GETtext/xml+votable180.050000true83.616375-5.44294440.005555555555555556Cone search capability for table J/A+A/666/A55/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/666/A55/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/666/A55/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/666/A55/list?GETtext/xml+votable180.050000true83.8166667-5.38805560.0055555555555555566/21438-21439 22804-228052.85864675833786e-19 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/666/A55?format=asciiX-rayOpticaldefaultJ/A+A/666/A55/table1YSOs analyzed in this study and effective temperatures, extinctions, and distances from the literaturerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLCShow the Light curvesmeta.ref.urlcharNameObject name (1)meta.id;meta.maincharprimaryRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainTeffEffective temperatureKphys.temperature.effectiveintAVExtinction in the V band (2)magphys.absorptionfloatDistDistance (3)pcpos.distancefloatSimbadSimbad column added by the CDSmeta.ref.urlchare_DistLower uncertainty on Distpcstat.errorfloatE_DistUpper uncertainty on Distpcstat.error;stat.maxfloatNotesNotes on Teff and Dist (4)meta.notecharParamindicates stellar parameters in table3meta.ref.urlcharJ/A+A/666/A55/table2SDSS u'g'r' photometry obtained with WWFIrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject name as listed in SIMBADmeta.id;meta.maincharJDJulian date of the observationdtime.epochdoubleumagSDSS uprime magnitudemagphot.mag;em.opt.Ufloate_umagUncertainty of umagmagstat.error;phot.magfloatgmagSDSS gprime magnitudemagphot.mag;em.opt.Bfloate_gmagUncertainty of gmagmagstat.error;phot.magfloatrmagSDSS rprime magnitudemagphot.mag;em.opt.Rfloate_rmagUncertainty of rmagmagstat.error;phot.magfloatJ/A+A/666/A55/table3Stellar parameters and accretion values of the WWFI samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject name (1)meta.id;meta.maincharJDJulian date (2)dtime.epochdoubleAvExtinction in the V bandmagphys.absorptionfloate_AvUncertainty of Avmagstat.errorfloatLAccLog of the accretion luminositylog(solLum)phys.luminosityfloate_LAccUncertainty of LAcclog(solLum)stat.errorfloatLBolLog of the bolometric luminositylog(solLum)phys.luminosityfloate_LBolUncertainty of LBollog(solLum)stat.errorfloatRadStellar radiussolRadphys.size.radiusfloate_RadUncertainty of RadsolRadstat.errorfloatMassStellar mass (3)solMassphys.massfloate_MassUncertainty of MasssolMassstat.error;phys.massfloatLAgeLog of the isochronal age (3)log(yr)time.agefloate_LAgeUncertainty of LAgelog(yr)stat.errorfloatLMaccLog of the mass accretion ratelog(solMass.yr**-1)arith.rate;phys.massfloate_LMaccUncertainty of LMacclog(solMass.yr**-1)stat.errorfloatCL[0/4] Confidence level (4)meta.code.qualintJ/A+A/666/A55/listList of fits imagesFilterFiltermeta.id;instr.filtercharExpTotal accumulated exposure timestime.duration;obs.exposureintsizeSize of FITS fileKibytephys.size;meta.fitsintFileName of the fits file in the subdirectory fitsmeta.id;meta.fitscharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian Date of the observationdtime.epochdoubleRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainScaleScale of the imagearcsec/pixinstr.scalefloatNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberint