J/ApJ/764/73ivo://CDS.VizieR/J/ApJ/764/73doi:10.26093/cds/vizier.17640073CDSPang X.Grebel E.K.Allison R.J.Goodwin S.P.Altmann M.Harbeck D.,Moffat A.F.J.Drissen L.2017-07-04T07:08:00Z2014-11-19T13:41:58ZCDS support team

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

cds-question@unistra.frstellar-associationsopen-star-clustershst-photometryproper-motionsWe present deep Hubble Space Telescope/Wide Field and Planetary Camera 2 photometry of the young HD 97950 star cluster in the giant H II region NGC 3603. The data were obtained in 1997 and 2007 permitting us to derive membership based on proper motions of the stars. Our data are consistent with an age of 1 Myr for the HD 97950 cluster. A possible age spread, if present in the cluster, appears to be small. The global slope of the incompleteness-corrected mass function for member stars within 60" is {Gamma}=-0.88+/-0.15, which is flatter than the value of a Salpeter slope of -1.35. The radially varying mass function shows pronounced mass segregation ranging from slopes of -0.26 +/-0.32 in the inner 5" to -0.94+/-0.36 in the outermost annulus (40"-60"). Stars more massive than 50M_{sun}_ are found only in the cluster center. The {Lambda} minimum spanning tree technique confirms significant mass segregation down to 30M_{sun}_. The dependence of {Lambda} on mass, i.e., that high-mass stars are more segregated than low-mass stars, and the (weak) dependence of the velocity dispersion on stellar mass might imply that the mass segregation is dynamical in origin. While primordial segregation cannot be excluded, the properties of the mass segregation indicate that dynamical mass segregation may have been the dominant process for segregation of high-mass stars.2013ApJ...764...73Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/764/73CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)J/A+A/548/A97 : Catalogue of variable stars in open clusters (Zejda+, 2012)J/ApJ/675/1319 : Infrared photometry of NGC 3603 (Harayama+, 2008)J/MNRAS/368/253 : Faint emission lines in NGC 3603 (Garcia-Rojas+, 2006)J/A+A/446/949 : Open clusters proper motions based on UCAC2 (Dias+, 2006)J/AJ/127/1014 : CCD UBVRIHa photometry in NGC 3603 (Sung+, 2004)J/AZh/80/8 : Proper motions of open star clusters (Loktin+, 2003)J/MNRAS/335/233 : Integrated Spectra of Open Clusters (Piatti+, 2002)J/MNRAS/327/23 : CCD UBVRI photometry of 7 open star clusters (Sagar+, 2001)J/PAZh/25/10 : Young open clusters space-age distribution (Dambis, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/764/73https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/764/73http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/764/73https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/764/73https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/764/73http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/764/73GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/764/73/table2 (The VI photometry and relative proper motions of the member stars on the PC chip of WFPC2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/764/73/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/764/73/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/764/73/table2?GETtext/xml+votable180.050000true168.77895694-61.261005280.0055555555555555566/379242.0401237512456292e-19 4.2441532724171825e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/764/73?format=asciiOpticaldefaultJ/ApJ/764/73/wfcVI photometry and relative proper motions of the member stars on the WFC2 and WFC4 chips of WFPC2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintChipSimbad column added by the CDSmeta.id;instrcharSeqStar running sequence numbermeta.id;meta.mainintXposX pixel coordinate from the 2007 WFPC2 datapixpos.cartesian.xfloatYposY pixel coordinate from the 2007 WFPC2 datapixpos.cartesian.yfloatVmag[11.9/23.7] V band magnitude from the 1997 WFPC2 datamagphot.mag;em.opt.VfloatImag[10.3/21.2] I band magnitude from the 1997 WFPC2 datamagphot.mag;em.opt.IfloatRad[0.9/59.4] Cluster-centric distancearcsecpos.angDistancefloatpmRA[-1.2/1.3] Proper motion along X pixel directionmas/yrpos.pm;pos.eq.radoublepmDE[-1.4/1.4] Proper motion along Y pixel directionmas/yrpos.pm;pos.eq.decdoubleJ/ApJ/764/73/table2The VI photometry and relative proper motions of the member stars on the PC chip of WFPC2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqStar running sequence numbermeta.id;meta.mainintXposX pixel coordinate from the 2007 WFPC2 datapixpos.cartesian.xfloatYposY pixel coordinate from the 2007 WFPC2 datapixpos.cartesian.yfloatVmag[11.9/23.7] V band magnitude from the 1997 WFPC2 datamagphot.mag;em.opt.VfloatImag[10.3/21.2] I band magnitude from the 1997 WFPC2 datamagphot.mag;em.opt.IfloatRad[0.9/59.4] Cluster-centric distancearcsecpos.angDistancefloatpmRA[-1.2/1.3] Proper motion along X pixel directionmas/yrpos.pm;pos.eq.radoublepmDE[-1.4/1.4] Proper motion along Y pixel directionmas/yrpos.pm;pos.eq.decdouble_RASimbad column added by the CDSdegpos.eq.ra;meta.main_DESimbad column added by the CDSdegpos.eq.dec;meta.main