J/A+A/595/A22ivo://CDS.VizieR/J/A+A/595/A22doi:10.26093/cds/vizier.35950022CDSRoser S.Schilbach E.Goldman B.2017-04-11T09:11:04Z2017-03-09T15:07:06ZCDS support team

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

cds-question@unistra.fropen-star-clustersproper-motionsphotometryOne of the results of the Milky Way Star Clusters (MWSC) survey was the detection of a slight under-density of old (ca. 1Gyr) clusters within the nearest kilo-parsec from the Sun. This under-density may be due to an ineffectiveness in the detection of larger structures with lower surface brightness. We report on our attempts to reveal such clusters. We derived proper motions from a combination of Tycho-2 with URAT1, and obtained a mean precision of about 1.4mas/yr per co-ordinate for 1.3 million stars north of -20{deg} declination. We cut the sky into narrow proper motion slices and searched for spatial over-densities of stars in each slice. We then examined stars from over-densities in optical and near-infrared colour-magnitude diagrams to determine if they are compatible with isochrones of a cluster. We estimated the field star contamination using our data and the Besancon Galactic model. We detected nine hitherto unknown open clusters in the vicinity of the Sun with ages between 70Myr and 1Gyr, and distances between 200 and 500pc.2016A&A...595A..22Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/595/A22CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/595/A22https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/595/A22http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/595/A22https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/595/A22https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/595/A22http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/595/A22GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/595/A22/table1 (New open clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/595/A22/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/595/A22/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/595/A22/table1?GETtext/xml+votable180.050000true75.5737.560.0055555555555555566/1326 1852 7015 14306 14689 14790 15224 40876https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/595/A22?format=asciiOpticaldefaultJ/A+A/595/A22/table1New open clustersDistDistancepcpos.distance;pos.heliocentricintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCluster name (RSGN, RSG9y RSG9o)meta.id;meta.maincharNmenbNumber of probable membersmeta.numberintGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latfloatRAJ2000Cluster center right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000Cluster center declination (J2000.0)degpos.eq.dec;meta.mainpmRAAverage proper motion in RA*cos(DE)mas/yrpos.pm;pos.eq.rafloate_pmRAStandard error in pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEAverage proper motion in DEmas/yrpos.pm;pos.eq.decfloate_pmDEStandard error in pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatlogtLogarithm of agelog(yr)time.agefloatZDistance from the Galactic Planepcpos.cartesian.z;pos.galacticfloatE(B-V)Colour-excessmagphot.color.excessfloatMODApparent distance modulusmagphot.mag.distModfloat