J/A+A/580/A26ivo://CDS.VizieR/J/A+A/580/A26doi:10.26093/cds/vizier.35800026CDSGalli P.A.B.Bertout C.Teixeira R.Ducourant C.2017-09-20T05:13:55Z2015-12-11T07:54:31ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsstellar-agesstellar-massesIn a recent study, we derived individual distances for 109 pre-main sequence stars that define the Lupus kinematic association of young stars. Here, we use these new distances to derive the masses and ages of Lupus T Tauri stars with the aim of better constraining the lifetime of their circumstellar disks. Using the photometric and spectroscopic information available in the literature, we computed the photospheric luminosity of 92 T Tauri stars in the Lupus association. Then, we estimated their masses and ages from theoretical evolutionary models. Based on Monte Carlo simulations and statistical tests, we compare the mass and age distribution of the classical T Tauri stars (CTTS) and weak-line T Tauri (WTTS) in our sample. We show that the CTTSs are on average younger than the WTTSs and that the probability that both T Tauri subclasses are drawn from the same mass and age parental distribution is very low. Our results favor the scenario proposed earlier for the Taurus-Auriga association, where the CTTSs evolve into WTTSs when their disks are fully accreted by the star. Based on an empirical disk model, we find that the average disk lifetime for the T Tauri stars in the Lupus association is {tau}_d_=3x10^6^(M_*_/M_{sun}_)^0.55^yr. We find evidence that the average lifetime of the circumstellar disks in the Lupus association is shorter than in the Taurus-Auriga association and discuss the implications of this result.2015A&A...580A..26Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/580/A26CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/580/A26https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/580/A26http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/580/A26https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/580/A26https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/580/A26http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/580/A26GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/580/A26/table1 (Physical properties of the Lupus comoving stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/580/A26/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/580/A26/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/580/A26/table1?GETtext/xml+votable180.050000true227.2243125-37.26271110.0055555555555555565/10678 6/42586 42595 42598-42599 42609-42612 42614-42617 42619 42653 42679 42683 42685 42689 42692-42693 42695 42699 42703-42705 42707-42708 42719 42725 42727-42728 42730 42735-42736 42738-42739 42760 44050-44051 44061 44063 44104https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/580/A26?format=asciidefaultJ/A+A/580/A26/table1Physical properties of the Lupus comoving starsSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharn_Star[*] *: binary (or multiple) systems (see Sect. 2)meta.notecharSpTypeMK spectral typesrc.spTypecharTeffEffective temperatureKphys.temperature.effectiveintEWHa? H{alpha} equivalent width0.1nmspect.line.eqWidth;em.line.HalphafloatnullableAV? Visual extinctionmagphys.absorption;em.opt.Vfloatnullablee_AV? rms uncertainty on AVmagstat.errorfloatnullablen_AV[:] : denotes a non-physical negative value or a non-significant resultmeta.notecharMassMass derived from the Siess et al. (2000A&A...358..593S) modelssolMassphys.massfloate_Massrms uncertainty on MasssolMassstat.error;phys.massfloatlogtAge derived from the Siess et al. (2000A&A...358..593S) modelslog(Myr)time.agefloate_logtrms uncertainty on Agelog(Myr)stat.errorfloatTTauT Tauri sub-classmeta.notecharlogtauDisk lifetime computed from Eq. (5), tau=~3*10^6^(M*/M_{sun})^0.55(+/-0.10)^yrlog(Myr)time.epochfloate_logtaurms uncertainty on logtaulog(Myr)stat.errorfloatRefsSources of photometric/spectroscopic information (1)meta.bibchar_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.main