J/AJ/163/74ivo://CDS.VizieR/J/AJ/163/74doi:10.26093/cds/vizier.51630074CDSThanathibodee T.Calvet N.Hernandez J.Mauco K.Briceno C.2024-11-12T11:34:31Z2022-04-26T06:42:49ZCDS support team

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

cds-question@unistra.fraccretionvariable-starsinfrared-astronomyspectroscopystellar-radiistellar-masseseffective-temperatureextinctionObservations have shown that the disk frequency and the fraction of accreting pre-main-sequence stars decrease with the age of the population and that some stars appear to have disks while their accretion has stopped. Still, it is unclear how disk-bearing stars stop their accretion. To provide insight into the last stages of accretion in low-mass young stars, we conducted a survey of disk-bearing stars that are thought to be non-accretors to identify stars still accreting at very low rates. Here we present the first catalog of the survey of 170 disk-bearing non-accreting stars in Chamaeleon I, Orion OB1, Upper Scorpius, {gamma} Velorum, and Upper Centaurus-Lupus, using HeI {lambda}10830 as a sensitive probe of accretion. We classify the line profiles into six types and argue that those showing redshifted and/or blueshifted absorption are still accreting. Using these classifications, we found that, among disk-bearing stars previously classified as non-accretors, at least 20%-30% are still accreting, with a larger fraction of those at younger population ages. While the difference between the outer disk signature and accretion status is unclear, we found a difference between the inner disk excess and accretion status. There is no preference in the mass of the newly identified accretors, suggesting that the processes inhibiting accretion do not directly depend on mass in the typical mass range of T Tauri stars. Lastly, we found that at a low accretion level, the "H{alpha} width at the 10% height" criterion mischaracterizes a larger fraction of accretors than the line's equivalent width.2022AJ....163...74Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/163/74CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/163/74https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/163/74http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/163/74https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/163/74https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/163/74http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/163/74GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/163/74/table2 (Log of observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/163/74/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/163/74/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/163/74/table2?GETtext/xml+votable180.050000true75.57289167-4.140508330.0055555555555555565/5715 9239 11091 6/21435 21437-21439 22804-22805 22807 22828-22829 22839 22843 22848 22851-22852 22854 22856 22859 22873-22874 22881 22883-22886 22888-22889 22893-22894 22905 22977 22992-22994 23025 37128-37129 39216 42598 42704 42943 42958 42978-42979 42984-42985 42991 42994 43415 44352 44354-44355 44360-44361 44363 44376 44378-44379 44385 44389 44401-44402 44404https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/163/74?format=asciiInfrareddefaultJ/AJ/163/74/table2Log of observationsSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDThe 2MASS or UGCS identifiermeta.id;meta.maincharprimaryNameAlternative identifiermeta.idcharRAJ2000[05/16] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainObs[2018/2020] Year of the observationtime.epochAirmass[1.01/2.08] Airmassobs.airMassfloatTexp[10/920] Exposure timestime.duration;obs.exposurefloatSNR[23.2/278] Signal-to-Noisestat.snrfloatJ/AJ/163/74/table4Line profile measurementsEWr[-4.7/1.2]? HeI(1.083um) red equivalent width (1)0.1nmspect.line.eqWidthfloatnullablevbb[-344/-67.4]? Blue feature's blue velocity edgekm/sphys.velocfloatnullablev0b[-182/-14.6]? Blue feature's velocity centerkm/sphys.velocfloatnullablevrb[-108/84.7]? Blue feature's red velocity edgekm/sphys.velocfloatnullablevbc[-262/29.7]? Central feature's blue velocity edgekm/sphys.veloc;em.wl.centralfloatnullablev0c[-70.4/67.1]? Central feature's velocity centerkm/sphys.veloc;em.wl.centralfloatnullablevbr[-118/148]? Red feature's blue velocity edgekm/sphys.velocfloatnullablev0r[15.8/220]? Red feature's velocity centerkm/sphys.velocfloatnullablevrr[103/480]? Red feature's red velocity edgekm/sphys.velocfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDThe 2MASS or UGCS identifiermeta.id;meta.maincharNameAlternate identifiermeta.idcharObs[2018/2020] Year of the observationtime.epochTypeProfile type; see Section 3.2meta.id;stat.fitcharEWb[-2.7/1.5]? HeI(1.083um) blue equivalent width (1)0.1nmspect.line.eqWidthfloatnullableEWc[-2.7/3.7]? HeI(1.083um) central equivalent width (1)0.1nmspect.line.eqWidthfloatnullablevrc[8.8/229]? Central feature's red velocity edgekm/sphys.veloc;em.wl.centralfloatnullableJ/AJ/163/74/tablea1Properties of observed targetsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintr_SpTypeReference code for SpType (1)meta.ref;pos.frameintEW[-0.2/24.1]? H{alpha} equivalent width0.1nmspect.line.eqWidthfloatnullabler_EW? Reference code for EW (1)meta.ref;spect.line.eqWidthintnullableW10[72/275]? Width at 10% H{alpha} line peakkm/sspect.line.eqWidthfloatnullabler_W10? Reference code for W10 (1)meta.ref;pos.frameintnullableTeff[2860/5030] Effective temperatureKphys.temperature.effectiveintAV[0/5.03] V band extinctionmagphys.absorptionfloatr_AVReference code for AV (1)meta.ref;pos.frameintMass[0.1/1.79] MasssolMassphys.massfloatRad[0.45/3.23] RadiussolRadphys.size.radiusfloatNoteAdditional note (2)meta.notecharIDThe 2MASS or UGCS identifiermeta.id;meta.maincharNameAlternate identifiermeta.idcharSpTypeSpectral typesrc.spTypechar