J/MNRAS/376/580ivo://CDS.VizieR/J/MNRAS/376/580doi:10.26093/cds/vizier.73760580CDSJeffries R.D.Oliveira J.M.Naylor T.Mayne N.J.Littlefair S.P.2024-07-04T20:18:10Z2008-03-25T11:50:30ZCDS support team

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

cds-question@unistra.fropen-star-clusterspre-main-sequence-starsvisible-astronomykron-cousins-photometryWe have used Cousins RI CCD photometry from the Isaac Newton telescope and intermediate-resolution spectroscopy from the Gemini North telescope to identify and characterize low-mass (0.15<M/M_{sun}_<1.3) pre-main-sequence stars in the young open cluster NGC 2169. Isochrone fitting to the high- and low-mass populations yields an intrinsic distance modulus of 10.13^+0.06^_-0.09_mag and a model-dependent age of 9+/-2Myr. Compared to the nearby, kinematically defined groups of a similar age, NGC 2169 has a large low-mass population which potentially offers a more precise statistical investigation of several aspects of star formation and early stellar evolution. By modelling the distribution of low-mass stars in the IC versus RC IC diagram, we find that any age spread among cluster members has a Gaussian full width at half-maximum (FWHM) 2.5Myr. A young age and a small age spread (<10Myr) are supported by the lack of significant lithium depletion in the vast majority of cluster members. There is no clear evidence for accretion or warm circumstellar dust in the low-mass members of NGC 2169, bolstering the idea that strong accretion has ceased and inner discs have dispersed in almost all low-mass stars by ages of 10Myr.2007MNRAS.376..580Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/376/580CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/376/580https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/376/580http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/376/580https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/376/580https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/376/580http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/376/580GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/376/580/table3 (NGC 2169 Rc versus Rc-Ic photometric catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/376/580/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/376/580/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/376/580/table3?GETtext/xml+votable180.050000true92.1333791713.966930560.005555555555555556Cone search capability for table J/MNRAS/376/580/targets (Identification and spectral analysis results for the 47 targets observed in three separate GMOS masks)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/376/580/targets?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/376/580/targets?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/376/580/targets?GETtext/xml+votable180.050000true92.1619958313.906236110.0055555555555555566/23762-23763 23768-23769https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/376/580?format=asciiOpticaldefaultJ/MNRAS/376/580/table3NGC 2169 Rc versus Rc-Ic photometric cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField designationmeta.id;meta.mainfloatStarStar number in the fieldmeta.id;obs.fieldintn_StarSimbad column added by the CDSmeta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainindexedDEJ2000Declination (J2000)pos.eq.dec;meta.mainindexedXposX positionpixpos.cartesian.x;instr.detdoubleYposY positionpixpos.cartesian.y;instr.detdoubleIcmag? Cousins I magnitudemagphot.mag;em.opt.Ifloatnullablee_Icmag? rms uncertainty on Icmagmagstat.error;phot.mag;em.opt.Ifloatnullablef_IcmagFlag for Icmag (1)meta.codecharRc-Ic? Cousins R-I colour indexmagphot.color;em.opt.R;em.opt.Ifloatnullablee_Rc-Ic? rms uncertainty on Rc-Icmagstat.error;phot.color;em.opt.Rfloatnullablef_Rc-IcFlag for Rc and Ic (1)meta.codecharJ/MNRAS/376/580/targetsIdentification and spectral analysis results for the 47 targets observed in three separate GMOS masksrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMask[1/3] Mask numbermeta.id;instrintTargetTarget numbermeta.id;meta.mainintSpTypePhotometric spectral typesrc.spTypecharS/NSignal-to-noise ratiostat.snrintl_EW(Li)Limit flag on EW(Li)meta.code.errorcharEW(Li)? Li Equivalent width0.1nmspect.line.eqWidthfloatnullablee_EW(Li)? rms uncertainty on EW(Li)0.1nmstat.errorfloatnullableFWHM(Li)? Li FWHM0.1nmspect.line.widthfloatnullableEW(Ha)? H{alpha} Equivalent width0.1nmspect.line.eqWidth;em.line.HalphafloatnullableRVRadial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_RVrms uncertainty on RVkm/sstat.errorfloatMmMembership flag (1)meta.code.membercharFieldField designationmeta.idfloatStarStar number in the fieldmeta.id;obs.fieldintRAJ2000? Right ascension (J2000)pos.eq.ra;meta.mainnullableDEJ2000? Declination (J2000)pos.eq.dec;meta.mainnullableIcmag? Cousins I magnitudemagphot.mag;em.opt.Ifloatnullablee_Icmag? rms uncertainty on Icmagmagstat.error;phot.mag;em.opt.IfloatnullableRc-Ic? Cousins R-I colour indexmagphot.color;em.opt.R;em.opt.Ifloatnullablee_Rc-Ic? rms uncertainty on Rc-Icmagstat.error;phot.color;em.opt.RfloatnullableNote[a] a: Repeated in this maskmeta.notechar