J/MNRAS/476/3245ivo://CDS.VizieR/J/MNRAS/476/3245doi:10.26093/cds/vizier/bg-ew-35dCDSJackson R.J.Deliyannis C.P.Jeffries R.D.2026-08-03T07:29:31Z2023-10-10T16:04:27ZCDS support team

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

cds-question@unistra.fropen-star-clustersm-starsstellar-massesinfrared-photometryvisible-astronomyRotation periods obtained with the Kepler satellite have been combined with precise measurements of projected rotation velocity from the WIYN 3.5-m telescope to determine the distribution of projected radii for several hundred low-mass (0.1<=M/M_{sun}_<=0.8), fast-rotating members of the Pleiades cluster. A maximum likelihood modelling technique, that takes account of observational uncertainties, selection effects and censored data, and considers the effects of differential rotation and unresolved binarity, has been used to find that the average radius of these stars is 14+/-2 per cent larger at a given luminosity than predicted by current evolutionary models of Dotter et al. and Baraffe et al. The same models are a reasonable match to the interferometric radii of older, magnetically inactive field M dwarfs, suggesting that the over-radius may be associated with the young, magnetically active nature of the Pleiades objects. No evidence is found for any change in this over-radius above and below the boundary marking the transition to full convection. Published evolutionary models that incorporate either the effects of magnetic inhibition of convection or the blocking of flux by dark star-spots do not individually explain the radius inflation, but a combination of the two effects might. The distribution of projected radii is consistent with the adopted hypothesis of a random spatial orientation of spin axes; strong alignments of the spin vectors into cones with an opening semi-angle <30{deg} can be ruled out. Any plausible but weaker alignment would increase the inferred over-radius.2018MNRAS.476.3245Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/476/3245CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/476/3245https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/476/3245http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/476/3245https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/476/3245https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/476/3245http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/476/3245GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/476/3245/table2 (Properties of observed science targets in the Pleiades and reference slow rotators in Praesepe (corrected version, 16-Apr-2024))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/476/3245/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/476/3245/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/476/3245/table2?GETtext/xml+votable180.050000true54.9430666723.981441670.0055555555555555565/115 118 6/361 455 457 484-485 496 499https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/476/3245?format=asciiOpticalInfrareddefaultJ/MNRAS/476/3245/table2Properties of observed science targets in the Pleiades and reference slow rotators in Praesepe (corrected version, 16-Apr-2024)SimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS name (JHHMMSSss+DDMMSS)meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainKmag2MASS K magnitudemagphot.mag;em.IR.Kfloat(V-K)0Deredenned V-K colour indexmagphot.color;em.opt.V;em.IR.KfloatPerPerioddtime.periodfloatr_Per[1/3] Period reference (1)meta.ref;pos.frameintBCKBolometric correctionmagphot.mag.bcfloatlogLLuminositylog(solLum)phys.luminosityfloatlogMMass (2)log(solMass)phys.massfloatlogRRadius (2)log(solRad)phys.size.radiusfloatvsiniPredicted equatorial velocitykm/sphys.veloc;pos.eqfloatJ/MNRAS/476/3245/table4Measured values of relative RV, FWHM, vsini, and RsiniPerPerioddtime.periodfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS name (JHHMMSSss+DDMMSS)meta.id;meta.maincharKMAGAbsolute 2MASS K magnitudemagphys.magAbsfloatlogLLuminositylog(solLum)phys.luminosityfloatS/NSignal-to-noise ratiostat.snrfloatRVRadial velocitykm/sphys.veloc;pos.heliocentricfloate_RVRadial velocity errorkm/sstat.errorfloatFWHMFWHMkm/sspect.line.widthfloate_FWHMFWHM errorkm/sstat.error;phys.angSizefloatFWHM0Deredenned errorkm/sspect.line.widthfloatl_vsiniLimit flag on vsinimeta.code.error;phys.veloc.rotatcharvsiniRotational velocitykm/sphys.veloc.rotatfloatSVsini? Precision in vsinikm/smeta.code.qualfloatnullablel_RsiniLimit flag on Rsinimeta.code.errorcharRsiniRadiussolRadphys.size.radiusfloat