J/A+A/329/101ivo://CDS.VizieR/J/A+A/329/101doi:10.26093/cds/vizier.33290101CDSRaboud D.Mermilliod J.-C.1998-01-16T14:11:47Z1998-01-16T15:11:32ZCDS support team

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

cds-question@unistra.fropen-star-clustersstellar-massesOn the basis of the best available member list and duplicity information, we have studied the radial distribution of 270 stars and multiple systems earlier than K0 in the Pleiades. Five new long period spectroscopic binaries have been identified from the CORAVEL observations. We have found a clear mass segregation between binaries and single stars, which is explained by the greater average mass of the multiple systems. The mass function of the single stars and primaries appears to be significantly different. While the central part of the cluster is spherical, the outer part is clearly elliptical, with an ellipticity of 0.17. The various parameters describing the Pleiades are (for a distance of 125pc): core radius r_c_=0.6 deg (1.4pc), tidal radius r_t_=7.4 (16pc), half mass radius r_m/2_=0.88 (1.9pc), harmonic radius r=1.82 (4pc). Low-mass stars (later than K0) probably extend further out and new proper motion and radial velocity surveys over a larger area and to fainter magnitudes would be very important to improve the description of the cluster structure and complete mass function.1998A&A...329..101Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/329/101CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/320/74 : Radial velocities of Pleiades members (Mermilliod+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/329/101https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/329/101http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/329/101https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/329/101https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/329/101http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/329/101GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/329/101/table3Star member list in the PleiadesRemRemarksmeta.notecharB-VB-V colourmagphot.color;em.opt.B;em.opt.VfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintnullableHIIStar number from Herzsprung (See Cat. <I/90>)meta.id;meta.mainintVmagV magnitudemagphot.mag;em.opt.Vfloatxposx coordinate (1)arcminpos.projfloatyposy coordinate (1)arcminpos.projfloatDistDistance from the cluster centerarcminpos.angDistancefloatMult[1/4] Multiplicity statusmeta.code.multipintMassTotal masssolMassphys.massfloatMassA? Component A masssolMassphys.massfloatnullableMassB? Component B masssolMassphys.massfloatnullableMassC? Component C masssolMassphys.massfloatnullableMassD? Component D masssolMassphys.massfloatnullable