J/MNRAS/468/931ivo://CDS.VizieR/J/MNRAS/468/931doi:10.26093/cds/vizier.74680931CDSMessina S.Parihar P.Distefano E.2024-08-17T20:18:57Z2020-01-31T11:37:51ZCDS support team

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

cds-question@unistra.frstellar-associationsyoung-stellar-objectsinfrared-photometryvisible-astronomyphotometryVery young stars, like the Orion Nebula Cluster (ONC) members analysed in the present study, exhibit photometric variability with a wide range of amplitudes. Such a prominent variability reflects in the inferred values of stellar colours and luminosities and, in turn, in the inferred stellar ages and masses. In this study, we measure the amplitudes of the photometric variability in V, R and I optical bands of a sample of 346 ONC members. We use these measurements to investigate how this variability affects the inferred masses and ages and whether it alone can account for the age spread among ONC members reported by earlier studies. We make use of colour-magnitude and Hertzprung-Russell (HR) diagrams. We find that members that show periodic and smooth photometric rotational modulation have masses and ages that are unaffected by variability when theoretical isochrones and evolutionary mass tracks are used in either colour-magnitude or HR diagrams. On the other hand, members with periodic but very scattered photometric rotational modulation and non-periodic members have masses and ages that are significantly affected. Moreover, using HR diagrams, we find that the observed I-band photometric variability can take account of only a fraction (~50 per cent) of the inferred age spread, whereas the V-band photometric variability is large enough to mask any age spread.2017MNRAS.468..931Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/468/931CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/468/931https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/468/931http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/468/931https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/468/931https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/468/931http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/468/931GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/468/931/table1 (Summary of V-band photometry of ONC members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/468/931/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/468/931/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/468/931/table1?GETtext/xml+votable180.050000true83.8269625-5.40194830.0055555555555555566/21438-21439https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/468/931?format=asciiOpticalInfrareddefaultJ/MNRAS/468/931/table1Summary of V-band photometry of ONC membersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[PMD2009]Star identification numbermeta.id;meta.mainintNobsNumber of observationsmeta.numberintNoutNumber of outliersmeta.numberintNseas[0/5] Season numbermeta.idintVmagmeanAverage V magnitudemagphot.mag;em.opt.Vfloate_Vmagmeanrms uncertainty on Vmagmeanmagstat.errorfloatsVmagtotStandard deviation computed for the complete 5-yr time seriesmagstat.errorfloatsVmagseasAverage seasonal standard deviationmagstat.errorfloatb_VmagFaintest V magnitude in the complete time seriesmagphot.mag;em.opt.VfloatB_VmagBrightest V magnitude in the complete time seriesmagphot.mag;em.opt.Vfloate_VmagPhotometric precisionmagstat.error;phot.magfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/468/931/table2Summary of I-band photometry of ONC membersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[PMD2009]Star identification numbermeta.id;meta.mainintNobsNumber of observationsmeta.numberintNoutNumber of outliersmeta.numberintNseas[0/5] Season numbermeta.idintImagmeanAverage I magnitudemagphot.mag;em.opt.Ifloate_Imagmeanrms uncertainty on Imagmeanmagstat.errorfloatsImagtotStandard deviation computed for the complete 5-yr time seriesmagstat.errorfloatsImagseasAverage seasonal standard deviationmagstat.errorfloatb_ImagFaintest I magnitude in the complete time seriesmagphot.mag;em.opt.IfloatB_ImagBrightest I magnitude in the complete time seriesmagphot.mag;em.opt.Ifloate_ImagPhotometric precisionmagstat.error;phot.magfloatJ/MNRAS/468/931/table3Summary of V-I photometry of ONC membersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[PMD2009]Star identification numbermeta.id;meta.mainintNobsNumber of observationsmeta.numberintNoutNumber of outliersmeta.numberintNseas[0/5] Season numbermeta.idintV-ImeanAverage V-I colour indexmagphot.color;em.opt.V;em.opt.Ifloate_V-Imeanrms uncertainty on V-Imeanmagstat.error;phot.color;em.opt.VfloatsV-ItotStandard deviation computed for the complete 5-yr time seriesmagstat.errorfloatsV-IseasAverage seasonal standard deviationmagstat.errorfloatb_V-IFaintest V-I colour in the complete time seriesmagphot.color;em.opt.V;em.opt.IfloatB_V-IBrightest V-I colour in the complete time seriesmagphot.color;em.opt.V;em.opt.Ifloate_V-IPhotometric precisionmagstat.error;phot.color;em.opt.VfloatJ/MNRAS/468/931/table4Summary of slopes and correlation coefficients of magnitude and color variation among different photometric bandsSeasonSeasonmeta.id;obscharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[PMD2009]Star identification numbermeta.id;meta.mainintHJDMean heliocentric Julian datedtime.epochdoubleNINumber of observation in I bandmeta.numberintNRNumber of observation in R bandmeta.numberintNVNumber of observation in V bandmeta.numberintbV-VI? Slope for V, V-Ispect.indexfloatnullablerV-VI? Correlation coefficient for V, V-Istat.correlationfloatnullablebR-RI? Slope for R, R-Ispect.indexfloatnullablerR-RI? Correlation coefficient for R, R-Istat.correlationfloatnullablebV-VR? Slope for V, V-Rspect.indexfloatnullablerV-VR? Correlation coefficient for V, V-Rstat.correlationfloatnullablebRI-VR? Slope for R-I, V-Rspect.indexfloatnullablerRI-VR? Correlation coefficient for R-I, V-Rstat.correlationfloatnullable