J/A+A/618/A12ivo://CDS.VizieR/J/A+A/618/A12doi:10.26093/cds/vizier.36180012CDSWilkinson S.Merin B.Riviere-Marichalar P.2018-11-05T10:52:51Z2018-10-04T08:09:15ZCDS support team

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

cds-question@unistra.fropen-star-clustersstandard-starsSelecting a cluster in proper motion space is an established method for identifying members of a star forming region. The first data release from Gaia (DR1) provides an extremely large and precise stellar catalogue, which when combined with the Tycho-2 catalogue gives the 2.5 million parallaxes and proper motions contained within the Tycho-Gaia Astrometric Solution (TGAS). We aim to identify new member candidates of the nearby Upper Scorpius subgroup of the Scorpius-Centaurus Complex within the TGAS catalogue. In doing so, we also aim to validate the use of the DBSCAN clustering algorithm on spatial and kinematic data as a robust member selection method. We constructed a method for member selection using a density-based clustering algorithm (DBSCAN) applied over proper motion and distance. We then applied this method to Upper Scorpius, and evaluated the results and performance of the method. We identified 167 member candidates of Upper Scorpius, of which 78 are new, distributed within a 10{deg} radius from its core. These member candidates have a mean distance of 145.6+/-7.5pc, and a mean proper motion of (-11.4, -23.5)+/-(0.7, 0.4)mas/yr. These values are consistent with measured distances and proper motions of previously identified bona-fide members of the Upper Scorpius association.2018A&A...618A..12Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/618/A12CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/746/154 : Improved kinematic parallaxes for Sco-Cen membersJ/ApJ/758/31 : IR photometry for members of Upper Sco (Luhman+, 2012)J/ApJ/756/133 : ScoCen debris disks around B- and A-type stars (Chen+, 2012)J/MNRAS/461/794 : Scorpius-Centaurus K-Type Stars (Pecaut+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/618/A12https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/618/A12http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/618/A12https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/618/A12https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/618/A12http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/618/A12GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/618/A12/table1 (Member candidates of Upper Scorpius)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/618/A12/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/618/A12/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/618/A12/table1?GETtext/xml+votable180.050000true241.76942810822803-16.9433503072237070.0055555555555555565/10744 11088-11090 11094 6/29320 29353 29358 30759 42749 42751 42811 42851 42854 42857 42861 42866 42873 42876 42886 42903 42908-42909 42911-42913 42917 42921 42925 42932 42939 42941 42943-42945 42949 42953 42955-42956 42958 42970 42972 42980-42982 42985-42987 42989-42991 42994-42995 43000 43002-43003 44289 44292-44293 44301-44303 44307-44308 44310 44312 44314 44317-44321 44324 44337 44341 44343 44346 44351 44365-44366 44368 44371 44385 44388-44389 44393 44397 44400 44403 44409 44435https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/618/A12?format=asciidefaultJ/A+A/618/A12/table1Member candidates of Upper ScorpiusrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the objectmeta.id;meta.maincharPlxAbsolute barycentric parallaxmaspos.parallax.trigdoublee_PlxParallax errormasstat.error;pos.parallaxdoubleRA_ICRSRight ascension (ICRS) at epoch 2015.0degpos.eq.ra;meta.maine_RA_ICRSError in Right ascensionmasstat.error;pos.eq.radoubleDE_ICRSDeclination (ICRS) at epoch 2015.0degpos.eq.dec;meta.maine_DE_ICRSError in Declinationmasstat.error;pos.eq.decdoublepmRAProper motion in right ascension, pmRA*cosDEmas/yrpos.pm;pos.eq.radoublee_pmRAError in proper motion in right ascensionmas/yrstat.error;pos.pm;pos.eq.radoublepmDEProper motion in declinationmas/yrpos.pm;pos.eq.decdoublee_pmDEError in proper motion in declinationmas/yrstat.error;pos.pm;pos.eq.decdoubleUSPreviously identified member of Upper Scorpius (1)meta.codecharUCLPreviously identified member of Upper Centaurus-Lupus (1)meta.codecharSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.decnullableindexed