J/A+A/574/L7ivo://CDS.VizieR/J/A+A/574/L7doi:10.26093/cds/vizier.35749007CDSSacco G.G.Jeffries R.D.Randich S.Franciosini E.Jackson R.J.,Cottaar M.Spina L.Palla F.Mapelli M.Alfaro E.J.Bonito R.,Damiani F.Frasca A.Klutsch A.Lanzafame A.Bayo A.Barrado D.,Jimenez-Esteban F.Gilmore G.Micela M.Vallenari A.Allende-Prieto C.,Flaccomio E.Carraro G.Costado M.T.Jofre P.Lardo C.Magrini L.,Morbidelli L.Prisinzano L.Sbordone L.2015-07-08T13:16:07Z2015-01-26T07:21:38ZCDS support team

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

cds-question@unistra.fropen-star-clusterss-starsinfrared-photometryvisible-astronomyphotometryspectroscopyThe nearby (distance ~350-400pc), rich Vela OB2 association, includes gamma^2^ Velorum, one of the most massive binaries in the solar neighborhood, and is an excellent laboratory for investigating the formation and early evolution of young clusters. Recent Gaia-ESO survey observations led to the discovery of two kinematically distinct populations in the young (10-15Myr) cluster immediately surrounding gamma^2^ Velorum. Here we analyse the results of Gaia-ESO survey observations of NGC 2547, a 35Myr cluster located two degrees south of gamma^2^ Velorum. The radial velocity distribution of lithium-rich pre-main sequence stars shows a secondary population, kinematically distinct and younger than NGC 2547. The radial velocities, lithium absorption lines, and the positions in a color-magnitude diagram of this secondary population are consistent with those of one of the components discovered around gamma^2^ Velorum. This result shows that there is a young, low-mass stellar population spread over at least several square degrees in the Vela OB2 association. This population could have originally been part of a cluster around gamma^2^ Velorum that expanded after gas expulsion, or formed in a less dense environment spread over the whole Vela OB2 region.2015A&A...574L...7Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/574/L7CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/324 : The Initial Gaia Source List (IGSL) (Smart, 2013)VI/137 : GaiaSimu Universe Model Snapshot (Robin+, 2012)J/A+A/561/A94 : Velocities and photometry in Trumpler 20 (Donati+, 2014)J/A+A/563/A94 : Kinematics of the Gamma Vel cluster (Jeffries+, 2014)J/A+A/566/A50 : Classification of stellar spectra 644-681nm (Damiani+, 2014)J/A+A/567/A55 : Metallicity of the gamma Velorum cluster (Spina+, 2014)J/A+A/569/A17 : Gaia-ESO Survey: NGC 6705 (Cantat-Gaudin+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/574/L7https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/574/L7http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/574/L7https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/574/L7https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/574/L7http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/574/L7GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/574/L7/table1 (Lithium rich stars in NGC 2547)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/574/L7/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/574/L7/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/574/L7/table1?GETtext/xml+votable180.050000true121.89429-49.069640.0055555555555555566/39181 39183 39192 391942.367228618189496e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/574/L7?format=asciiOpticalInfrareddefaultJ/A+A/574/L7/table1Lithium rich stars in NGC 2547RAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDEJ2000Declination (J2000)degpos.eq.dec;meta.mainVmag[11.7/19.5]? Johnson V magnitude (1)magphot.mag;em.opt.VfloatnullableRcmag[11.4/18.6]? Cousins R magnitude (2)magphot.mag;em.opt.RfloatnullableIcmag[11.2/16.8]Cousins I magnitude (2)magphot.mag;em.opt.IfloatEW(Li)[101/559] Equivalent width of the Li line at 670.8nm (in m{AA})0.1pmspect.line.eqWidth;em.opt.RfloatHRV[-9/63] Heliocentric radial velocity (3)km/sspect.dopplerVeloc;pos.heliocentricfloate_HRV[0.1/1.1] Error on HRV (3)km/sstat.errorfloatp(A)[0/1]? Probability to belong to NGC 2547A (4)stat.fit.goodnessfloatnullable