J/MNRAS/453/1026ivo://CDS.VizieR/J/MNRAS/453/1026doi:10.26093/cds/vizier.74531026CDSKalari V.M.Vink J.S.Drew J.E.Barentsen G.Drake J.J.Eisloffel J.,Martin E.L.Parker Q.A.Unruh Y.C.Walton N.A.Wright N.J.2024-08-15T20:14:54Z2016-05-17T12:34:45ZCDS support team

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

cds-question@unistra.fropen-star-clusterspre-main-sequence-starsaccretioninfrared-photometryvisible-astronomybroad-band-photometryh-alpha-photometryWe estimate the accretion rates of 235 Classical T Tauri star (CTTS) candidates in the Lagoon Nebula using ugri H{alpha} photometry from the VST Photometric H{alpha} survey+. Our sample consists of stars displaying H{alpha} excess, the intensity of which is used to derive accretion rates. For a subset of 87 stars, the intensity of the u-band excess is also used to estimate accretion rates. We find the mean variation in accretion rates measured using H{alpha} and u-band intensities to be ~0.17dex, agreeing with previous estimates (0.04-0.4dex) but for a much larger sample. The spatial distribution of CTTS align with the location of protostars and molecular gas suggesting that they retain an imprint of the natal gas fragmentation process. Strong accretors are concentrated spatially, while weak accretors are more distributed. Our results do not support the sequential star-forming processes suggested in the literature.2015MNRAS.453.1026Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/453/1026CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/395/499 : XMM observations in M8 and NGC6530 (Rauw+, 2002)J/ApJ/747/51 : Lagoon Nebula stars. I. Rotation periods (Henderson+, 2012)J/MNRAS/440/2036 : VPHAS+ survey synthetic colours (Drew+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/453/1026https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/453/1026http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/453/1026https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/453/1026https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/453/1026http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/453/1026GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/453/1026/table24 (VPHAS+ photometry (table2) and derived properties (table4) of candidate CTTS in the Lagoon Nebula)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/453/1026/table24?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/453/1026/table24?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/453/1026/table24?GETtext/xml+votable180.050000true270.63358-24.258880.0055555555555555566/28890-28891https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/453/1026?format=asciiOpticalInfrareddefaultJ/MNRAS/453/1026/table24VPHAS+ photometry (table2) and derived properties (table4) of candidate CTTS in the Lagoon NebulaSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName (HHMMSsss+DDMMSSs)meta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainrmagr magnitudemagphot.mag;em.opt.Rfloate_rmagrms uncertainty on rmagmagstat.error;phot.mag;em.opt.Rfloatr-ir-i colour indexmagphot.color;em.opt.R;em.opt.Ifloate_r-irms uncertainty on r-imagstat.error;phot.color;em.opt.Rfloatr-Har-H{alpha} colour indexmagphot.color;em.opt.R;em.line.Halphafloate_r-Harms uncertainty on r-H{alpha}magstat.errorfloatg-r? g-r colour indexmagphot.color;em.opt.B;em.opt.Rfloatnullablee_g-r? rms uncertainty on g-rmagstat.error;phot.color;em.opt.Bfloatnullableu-g? u-g colour indexmagphot.color;em.opt.U;em.opt.Bfloatnullablee_u-g? rms uncertainty on u-gmagstat.errorfloatnullableEWHaEquivalent width of H{alpha}0.1nmspect.line.eqWidth;em.line.Halphafloate_EWHarms uncertainty on EWH{alpha}0.1nmstat.errorfloatMassMasssolMassphys.massfloate_Massrms uncertainty on MasssolMassstat.error;phys.massfloatlogAgeAgelog(yr)time.agefloate_logAgerms uncertainty on logAgelog(yr)stat.error;time.agefloat(dMac/dt)HaAccretion rate derived from H{alpha}solMass/yrarith.ratefloate_(dMac/dt)Harms uncertainty on (dMac/dt)HasolMass/yrstat.errorfloat(dMac/dt)u? Accretion rate derived from u-bandsolMass/yrarith.ratefloatnullablee_(dMac/dt)u? rms uncertainty on (dMac/dt)usolMass/yrstat.errorfloatnullable