J/A+A/485/95ivo://CDS.VizieR/J/A+A/485/95doi:10.26093/cds/vizier.34850095CDSMermilliod J.-C.Platais I.James D.J.Grenon M.Cargile P.A.2008-08-19T13:52:11Z2008-08-19T13:48:02ZCDS support team

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

cds-question@unistra.fropen-star-clustersdwarf-starsinfrared-photometryvisible-astronomybroad-band-photometryproper-motionsradial-velocityThe nearby open cluster Blanco 1 is of considerable astrophysical interest for formation and evolution studies of open clusters because it is the third highest Galactic latitude cluster known. It has been observed often, but so far no definitive and comprehensive membership determination is readily available. An observing programme was carried out to study the stellar population of Blanco 1, and especially the membership and binary frequency of the F5-K0 dwarfs. We obtained radial-velocities with the CORAVEL spectrograph in the field of Blanco 1 for a sample of 148 F-G-K candidate stars in the magnitude range 10<V<14. New proper motions and UBVI CCD photometric data from two extensive surveys were obtained independently and are used to establish reliable cluster membership assignments in concert with radial-velocity data. The membership of 68 stars is confirmed on the basis of proper motion, radial velocity, and photometric criteria. Fourteen spectroscopic- and suspected binaries (2 SB2s, 9 SB1s, 3SB?) have been discovered among the confirmed members. Thirteen additional stars are located above the main sequence or close to the binary ridge, with radial velocities and proper motions supporting their membership. These are probable binaries with wide separations. Nine binaries (7 SB1 and 2 SB2) were detected among the field stars. The spectroscopic binary frequency among members is 20% (14/68); however, the overall binary rate reaches 40% (27/68) if one includes the photometric binaries. The cluster mean heliocentric radial velocity is +5.53+/-0.11km/s based on the most reliable 49 members. The Vsini distribution is similar to that of the Pleiades, confirming the age similarities between the two clusters.2008A&A...485...95Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/485/95CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/121/213 : BV photometry of Blanco 1 stars (Panagi+, 1997)J/A+A/399/919 : X-ray Luminosities in Blanco 1 (Pillitteri+, 2003)J/A+A/421/175 : XMM sources in Blanco 1 (Pillitteri+, 2004)J/MNRAS/364/272 : Elemental abundances in Blanco 1 (Ford+, 2005)J/A+A/471/499 : Low-mass stars and brown dwarfs in Blanco 1 (Moraux+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/485/95https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/485/95http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/485/95https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/485/95https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/485/95http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/485/95GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/485/95/table1 (Mean radial velocities and general information)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/485/95/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/485/95/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/485/95/table1?GETtext/xml+votable180.050000true359.861375-28.85386110.0055555555555555565/4122 6/16445 16447 16482-16483 16486 16492 16494 16533 16576-16577 16580https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/485/95?format=asciiOpticalInfrareddefaultJ/A+A/485/95/table1Mean radial velocities and general informationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWEBDAStar designation (WEBDA) in Blanco 1meta.id;meta.mainintSA140? Star number from SA 140meta.idintnullableZS? Number from de Epstein & Epstein (1985AJ.....90.1211D) (1)meta.idintnullableRAJ2000Right ascension (J2000, Ep=J2005.71)pos.eq.ra;meta.mainDEJ2000Declination (J2000, Ep=J2005.71)pos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.VfloatB-V? B-V colour indexmagphot.color;em.opt.B;em.opt.VfloatnullableU-B? U-B colour indexmagphot.color;em.opt.U;em.opt.BfloatnullableV-I? V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatnullableRVMean radial velocitykm/sspect.dopplerVeloc;stat.meanfloate_RVError on the radial velocitykm/sstat.errorfloato_VmagNumber of measurementsmeta.numberintDt? Time interval spent by the observationsdtime.interval;obsintnullableprVar? Probability of variability P(chi2)src.varfloatnullableVsiniProjected rotational velocitykm/sphys.veloc.rotatfloate_VsiniError on the rotational velocitykm/sstat.error;phys.veloc.rotatfloatpmRAProper motion in Right Ascensionmas/yrpos.pm;pos.eq.rafloatpmDEProper motion in Declinationmas/yrpos.pm;pos.eq.decfloatMmAstrometric membership probability%meta.code.memberintNotesMembership, or duplicitymeta.notechar