J/A+A/664/A70ivo://CDS.VizieR/J/A+A/664/A70doi:10.26093/cds/vizier.36640070CDSGalindo-Guil F.J.Barrado D.Bouy H.Olivares J.Bayo A.,Morales-Calderon M.Huelamo N.Sarro L. M.Riviere-Marichalar P.,Stoev H.Montesinos B.Stauffer J.R.2022-11-13T17:32:44Z2022-08-05T12:17:02ZCDS support team

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

cds-question@unistra.fropen-star-clustersbrown-dwarfsline-intensitiesvisible-astronomyStellar ages are key to improving our understanding of different astrophysical phenomena. However, many techniques to estimate stellar ages are highly model-dependent. The lithium depletion boundary (LDB), based on the presence or absence of lithium in low-mass stars, can be used to derive ages in stellar associations of between 20 and 500Ma. The purpose of this work is to revise former LDB ages in stellar associations in a consistent way, taking advantage of the homogeneous Gaia parallaxes as well as bolometric luminosity estimations that do not rely on monochromatic bolometric corrections. We studied nine open clusters and three moving groups characterised by a previous determination of the LDB age. We gathered all the available information from our data and the literature: membership, distances, photometric data, reddening, metallicity, and surface gravity. We re-assigned membership and calculated bolometric luminosities and effective temperatures using distances derived from Gaia DR2 and multi-wavelength photometry for individual objects around the former LDB. We located the LDB using a homogeneous method for all the stellar associations. Finally, we estimated the age by comparing it with different evolutionary models. We located the LDB for the twelve stellar associations and derived their ages using several theoretical evolutionary models. We compared the LDB ages among them, along with data obtained with other techniques, such as isochrone fitting, ultimately finding some discrepancies among the various approaches. Finally, we remark that the 32 Ori MG is likely to be composed of at least two populations of different ages.2022A&A...664A..70Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/664/A70CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/664/A70https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/664/A70http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/664/A70https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/664/A70https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/664/A70http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/664/A70GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/664/A70/tablee4 (Stellar properties and astrometric data from Gaia DR2 for all LDB samples)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/664/A70/tablee4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/664/A70/tablee4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/664/A70/tablee4?GETtext/xml+votable180.050000true52.012833350.67197220.0055555555555555565/115 5881 6/325 336 339-340 351 366 454-455 457 464 466-467 472-474 483-485 496 504 518 622 722 850 940 1059 1245 1727 1738 1769-1771 1774 2048 2743 3093 3095 3101 3136 3138-3139 3144 4468 5677 13450 13714 16447 16455 16488-16490 16514 16719 16747 16993 16997 17268 17288 17502 17602 17604 17606-17607 17744 17786 18344 18760 19144 19175 19382 19777 19877 20074 20257 20282 20602 20618 21051 21202 22535 22691 22773 22802 22856-22857 22868 22892-22893 22940 22942 22964 23003 23005 23007 23014 23029 23212 23388 23415 23469 23496 23501 23503 23509 23511-23512 23515 23529-23530 23533 23535-23536 23538-23539 23544-23545 23587 23593 23684 23690 23715 23722 23726 23731 23740 23743 24065-24066 24084 24086 24224 24236 24510 25745 28746 28929 28993 29052 29357 31787-31788 31790 31850 32830 32917 32930 32970 33006 33065 33170 33186 33342 33349 33355 33367 33382 33422 33429 33449 33456 33461 33464 33482 33501 33512-33513 33517 33520 33523 33529 33545 33551 33593-33594 33643 33666 33670 33689 33697 33706 33716 33718 33737 33756 33850 33919 33956 33965 33993 34012 34127 34312 34380 34450 34486 34530 34538 34577 34611 34699 34819 34830 34834 34840 34843 34857 34880 34885 34896 34959 34961 34963 35002 35027 35037 35131 35268 35415 35447 35531 35845 35847 35859 35885 35887 35924 35945 36129 36466 36543 36789 36833 36909 36948 37230-37231 37769 37787-37790 37809 37812 38054 39181 39183 41295 41538 41798 42176 42272 42483 43372 44056 44751 45073 45168 45238 45324 45336 45345 45378 45389 45394 45416 45471-45472 45492 45503 45510 45544 45576 45852 45876 45894 45967 45977 46082 46087 46207 46339 46601 46692 46739 46758 46922 46954 47120 47207 47242 47249 47273 47345 47486 47591 47626 47652 47823 47911 47941 47943 47979 48038 48064 48124 48263 48274 48318 48325 48361 48553 48569 48643 48648 48676 48905https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/664/A70?format=asciiOpticaldefaultJ/A+A/664/A70/tablee4Stellar properties and astrometric data from Gaia DR2 for all LDB samplesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObjectName of the objectmeta.id;meta.maincharn_Object[1/6]? Note on object (1)meta.noteintnullableAssocName of the stellar associationmeta.id.parentcharRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainplx? Parallax (parallax) from Gaia DR2maspos.parallax.trigfloatnullablee_plx? Standard error of parallax (parallax_error) from Gaia DR2masstat.error;pos.parallaxfloatnullablepmRA? Proper motion in right ascension direction, pmRA*cosDE (pmra) from Gaia DR2mas/yrpos.pm;pos.eq.radoublenullablee_pmRA? Error in proper motion in right ascension direction, (e_pmra) from Gaia DR2mas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE? Proper motion in declination direction, (pmdec) from Gaia DR2mas/yrpos.pm;pos.eq.decdoublenullablee_pmDE? Error in proper motion in declination direction, (e_pmdec) from Gaia DR2mas/yrstat.error;pos.pm;pos.eq.decfloatnullableRemarksRemarks of the object (6)meta.notecharrho[-1/1]? Correlation between proper motion in right ascension and proper motion in declination (pmra_pmdec_corr) from Gaia DR2stat.fit.paramfloatnullablel_EWLi[<=Y?-. ] Limit flag on EWLi (2)meta.code.errorcharEWLi? Lithium equivalent width or lower value of lithium equivalent width interval0.1nmspect.line.eqWidthfloatnullableEWLimax? Upper value of lithium equivalent width interval0.1nmspect.line.eqWidth;stat.maxfloatnullableE_EWLi? Uncertainty based on the inter-68th percentile range, 1{sigma} error, positive uncertainty (3)0.1nmstat.error;stat.maxfloatnullablee_EWLi? Uncertainty based on the inter-68th percentile range, 1{sigma} error, positive uncertainty (3)0.1nmstat.errorfloatnullabler_EWLi? Reference for the Lithium equivalent width assumed (4)meta.ref;pos.frameintnullableLirich[Y?N] Lithium richness of the object (5)meta.codechardmap? Most likely distance (dMAP) (7)pcpos.distancefloatnullableb_dmap? 2.5th percentile distance confidence interval (d025) (7)pcpos.distance;stat.fit.paramfloatnullableB_dmap? 97.5th percentile distance confidence interval (d975) (7)pcpos.distance;stat.fit.paramfloatnullableTeffChiEffective temperature with mininimization of Chi2 (8)Kstat.fit.chi2;phys.temperature.effectiveintLBolMost likely bolometric luminosity (LBolMAP)solLumphys.luminositydoubleLBolmin2.5th percentile bolometric luminosity confidence interval (d025)solLumphys.luminositydoubleLBolmax97.5th percentile bolometric luminosity confidence interval (d975)solLumphys.luminositydouble