J/A+A/332/575ivo://CDS.VizieR/J/A+A/332/575doi:10.26093/cds/vizier.33320575CDSBelikov A.N.Hirte S.Meusinger H.Piskunov A.E.Schilbach E.1998-06-05T15:00:28Z1998-06-05T15:00:25ZCDS support team

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

cds-question@unistra.fropen-star-clustersproper-motionsThe luminosity function (LF) of the Pleiades cluster stars was constructed for the study of the LF fine structure related to pre-main sequence (MS) stellar evolution. Theoretical luminosity functions based on present-day pre-MS and MS stellar models were constructed and compared with observations. We tested both power- and log-normal laws describing the cluster star Initial Mass Function (IMF). Both single star formation burst- and age spread-models were examined. The agreement between the observed Pleiades colour-magnitude diagram with the new HIPPARCOS distance and the theoretical ZAMS for a normal metallicity is excellent when the model positions in the HR diagram are corrected to the helium abundance Y=0.34. The corresponding age of the cluster is logt=7.95. Three features (dips) were found in the observed cluster LF in a magnitude range M_V_=5-12mag. Two of them (at M_V_=7.5mag and 9.5mag) are assumed to be field LF features: Wielen and Kroupa dips. Theoretical models fail to reproduce them. We attributed the third (brightest) detail (the dip at M_V_=5.5mag) to the pre-MS evolution of Pleiades stars. The observed Pleiades LF corresponds in its brighter part to the standard Population I IMF. The log-normal IMF fits the observations much better than a simple power-law IMF. The brightest LF feature could be reproduced in the theoretical LF if a substantial age spread of order of several tens of Myrs is supposed to exist among the Pleiades stars.1998A&A...332..575Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/332/575CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/239 : The Hipparcos and Tycho Catalogues (ESA 1997)J/A+A/299/696 : Pleiades field Membership probabilities (Schilbach+, 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/332/575https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/332/575http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/332/575https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/332/575https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/332/575http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/332/575GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/332/575/catalog (Star member list in the Pleiades)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/332/575/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/332/575/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/332/575/catalog?GETtext/xml+votable180.050000true59.126708324.28850.005555555555555556https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/332/575?format=asciiOpticaldefaultJ/A+A/332/575/catalogStar member list in the PleiadesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSRS95Star number from Schilbach et al. (1995, Cat. <J/A+A/299/696>)meta.idintspflagSpatial position flag (1)meta.codeintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination signpos.eq.dec;meta.mainpmRAProper motion along right ascension directionmas/yrpos.pm;pos.eq.rafloate_pmRAError in proper motion pmRAmas/yrstat.errorfloatpmDEProper motion along declination axismas/yrpos.pm;pos.eq.decfloate_pmDEError in proper motion pmDEmas/yrstat.errorfloatVmagV magnitudemagphot.mag;em.opt.Vfloatn_VmagMagnitude type flag (2)meta.noteintmemberProper motion membership probabilitymeta.code.memberfloatBDAStar number in the BDA, Mermilliod (1988BICDS..35...77M, 1992BICDS..40..115M)meta.id;meta.mainint