J/MNRAS/454/593ivo://CDS.VizieR/J/MNRAS/454/593doi:10.26093/cds/vizier.74540593CDSBell C.P.M.Mamajek E.E.Naylor T.2024-08-15T20:16:24Z2016-09-16T08:03:18ZCDS support team

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

cds-question@unistra.frstellar-associationsphotometrystellar-distanceWe present a self-consistent, absolute isochronal age scale for young (<~200Myr), nearby (<~100pc) moving groups in the solar neighbourhood based on homogeneous fitting of semi-empirical pre-main-sequence model isochrones using the {tau}^2^ maximum-likelihood fitting statistic of Naylor & Jeffries (2006MNRAS.373.1251N) in the M_V_, V-J colour-magnitude diagram. The final adopted ages for the groups are as follows: 149^+51^_-19_Myr for the AB Dor moving group, 24+/-3Myr for the {beta} Pic moving group (BPMG), 45^+11^_-7_Myr for the Carina association, 42^+6^_-4_Myr for the Columba association, 11+/-3Myr for the {eta} Cha cluster, 45+/-4Myr for the Tucana-Horologium moving group (Tuc-Hor), 10+/-3Myr for the TW Hya association and 22^+4^_-3_Myr for the 32 Ori group. At this stage we are uncomfortable assigning a final, unambiguous age to the Argus association as our membership list for the association appears to suffer from a high level of contamination, and therefore it remains unclear whether these stars represent a single population of coeval stars. Our isochronal ages for both the BPMG and Tuc-Hor are consistent with recent lithium depletion boundary (LDB) ages, which unlike isochronal ages, are relatively insensitive to the choice of low-mass evolutionary models. This consistency between the isochronal and LDB ages instils confidence that our self-consistent, absolute age scale for young, nearby moving groups is robust, and hence we suggest that these ages be adopted for future studies of these groups. Software implementing the methods described in this study is available from http://www.astro.ex.ac.uk/people/timn/tau-squared/.2015MNRAS.454..593Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/454/593CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/454/593https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/454/593http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/454/593https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/454/593https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/454/593http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/454/593GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/454/593/table1 (VJ photometry, spectral types and distances for member stars in our young moving groups)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/454/593/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/454/593/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/454/593/table1?GETtext/xml+votable180.050000true332.05825-46.96097220.0055555555555555566/46 129 601 674 719 722 765 784 826 850 940 1245 1412 1762 1787 2101 2374 2966 3163 4468 9507 9747 10203 10771 12417 12770 13450 13512 13674 14640 15686 16393 16426 16455 16543 16606 16719 16853 16930 16993 17274 17288 17394 17502 17552 17606-17607 17887 18538 18743 18797 19163 19777 19782 19888 19948 20074 20125 20257 20282 20327 20381 20491 20505 20507 20602 20618 20624 20632 20647 20657-20658 20701 21031 21050-21051 21083 21090 21139 21146 21180 21199 21202 21239 21377 21386 21420 21428 22146 22535 22647 22683 22773 22857 22964 22995 22999 23003 23005 23007 23028-23029 23094 23140 23155 23176 23388 23443 23690 23717 23738 23743 23870 24608 24629 24719 24740 24763 24843 25113 26133 26250 27392 27884 28746 28784 28993 29519 29924 29958 30328 30826 30860 31104 32844 32847 32868 32890-32891 32912 32917 32930 32937 32970 33006 33065 33116 33129 33167 33170 33186 33193 33237 33312 33342 33349 33355 33361 33367 33370 33382 33422 33429 33439 33449 33456 33461 33464 33468 33482 33493 33500-33501 33512-33513 33517 33520 33523 33529 33545 33551 33565 33583 33593-33594 33643 33666 33670 33677 33689 33694 33697 33704 33706-33707 33716 33718 33737 33756 33850 33894 33919 33937 33956 33965 33993 33996 34012 34054 34058 34074 34118 34126-34127 34152 34163-34164 34196 34203 34244-34245 34269 34312 34338 34380 34406 34415 34417 34423 34450 34464 34486 34509 34530 34577 34611 34683 34733 34736 34757 34781 34819 34823 34825 34829-34830 34834 34840 34843 34857 34880 34885-34886 34896 34920 34930 34959 34963 34998 35002 35018 35027 35037 35077 35112 35123 35131 35147 35149 35248 35268 35415 35447 35497 35531 35640 35814 35845 35847 35859 35861 35885 35945 36036 36130 36308 36466 36487 36509 36543 36713 36778 36907 36909 36948 36969 36978 37006 37012-37013 37075 37309 37387 37414 37418-37419 37486 37573 37638 37652 37690 38054 38061 38120 38199 38341 38347 38359 38363 38382 38440 38484 38487 38489 38687 38742 38797 38800 38850 38936 38950 39019 39044 39396 39584 39586 39735 39829 40435 40976 41158 41247 41295 41361 41482 41538 41681 41798 41854 42021 42096 42176 42242 42252 42272 42483 42910 43142 43571 43670 43677 43704 44439 44751 45069 45073 45120 45168 45247 45324 45336 45345 45351 45377-45378 45382 45389 45394 45416 45453 45471-45472 45475 45492 45503 45510 45538 45544 45746 45770 45852 45876 45894 45927 45931 45944 45964 45967 45977 45987 46082 46084 46087 46115 46201 46207 46236 46339 46383 46456 46601 46615 46629 46692 46739 46754 46758 46922 47120 47125 47205 47249 47287 47345 47626 47652 47703 47777 47863 47911 47941 47943 48038 48061 48124 48163 48263 48274 48318 48325 48361 48553 48559 48648 48651 48905 49135https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/454/593?format=asciiOpticaldefaultJ/MNRAS/454/593/table1VJ photometry, spectral types and distances for member stars in our young moving groupsSimbadNameSimbad column added by the CDSmeta.idcharVmagV magnitudemagphot.mag;em.opt.VfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharn_Star[*] Note on Star (1)meta.notecharGroupGroup (2)meta.idcharSpTypeMK spectral typesrc.spTypecharr_SpTypeReference fop SpType in refs.dat filemeta.ref;pos.framechare_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloatr_VmagReference for Vmag in refs.dat filemeta.ref;pos.frameintV-JV-J colour index, J-band photometry from 2MASS PSC unless otherwise statedmagphot.color;em.opt.V;em.IR.Jfloatn_V-J[bc] Note on V-J (3)meta.notechare_V-Jrms uncertainty on V-Jmagstat.error;phot.color;em.opt.VfloatDistDistancepcpos.distance;pos.heliocentricfloatn_Dist[d] Note on Dist (3)meta.notechare_Distrms uncertainty on Distpcstat.errorfloatr_DistReference for Dist in refs.dat filemeta.ref;pos.frameintVMAGAbsolute V magnitudemagphys.magAbs;em.opt.Vfloate_VMAGrms uncertainty on VMAGmagstat.errorfloatMemb[Y/N-] Membership flag (4)meta.code.errorchar_RAPositions from Simbad (right ascension part)degpos.eq.ra;meta.main_DEPositions from Simbad (declination part)degpos.eq.dec;meta.mainJ/MNRAS/454/593/refsReferencesBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notecharRefReference numbermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint