J/A+A/597/A63ivo://CDS.VizieR/J/A+A/597/A63doi:10.26093/cds/vizier.35970063CDSLanzafame A.C.Spada F.Distefano E.2019-05-09T15:05:48Z2016-12-23T13:26:38ZCDS support team

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

cds-question@unistra.fropen-star-clustersstellar-radiiAverage stellar radii in open clusters can be estimated from rotation periods and projected rotational velocities under the assumption of random orientation of the spin axis. Such estimates are independent of distance, interstellar absorption, and models, but their validity can be limited by missing data (truncation) or data that only represent upper/lower limits (censoring). We present a new statistical analysis method to estimate average stellar radii in the presence of censoring and truncation. We use theoretical distribution functions of the projected stellar radius Rsini to define a likelihood function in the presence of censoring and truncation. Average stellar radii in magnitude bins are then obtained by a maximum likelihood parametric estimation procedure. This method is capable of recovering the average stellar radius within a few percent with as few as ~10 measurements. Here it is applied for the first time to the dataset available for the Pleiades. We find an agreement better than ~10 percent between the observed R vs M_K_ relationship and current standard stellar models for 1.2>=M/M_{sun}_>=0.85 with no evident bias. Evidence of a systematic deviation at 2sigma level are found for stars with 0.8>=M/M_{sun}_=0.6 approaching the slow-rotator sequence. Fast-rotators (P<2d) agree with standard models within 15 percent with no systematic deviations in the whole 1.2>=M/M_{sun}_>=0.5 range. The evidence found of a possible radius inflation just below the lower mass limit of the slow-rotator sequence indicates a possible connection with the transition from the fast to the slow-rotator sequence.2017A&A...597A..63Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/597/A63CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/597/A63https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/597/A63http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/597/A63https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/597/A63https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/597/A63http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/597/A63GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/597/A63/table1 (Data used with the classification in rotational sequences)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/597/A63/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/597/A63/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/597/A63/table1?GETtext/xml+votable180.050000true52.890076111126.26550694440.0055555555555555565/113-115 118 121 124 6/361 449 451 466 478 480 483 492 494 500 504 507https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/597/A63?format=asciidefaultJ/A+A/597/A63/table1Data used with the classification in rotational sequencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameHATNet Designation (HAT-NNN-NNNNNNN) (1)meta.id;meta.maincharRAdegRight ascension J2000 (2)degpos.eq.raDEdegDeclination J2000 (2)degpos.eq.decB-V? B-V colour index (2)magphot.color;em.opt.B;em.opt.VfloatnullableKMAGAbsolute magnitude in K filter (3)magphys.magAbs;em.IR.KfloatMass? Stellar mass from MK and Baraffe et al. (2015A&A...577A..42B) modelssolMassphys.massfloatnullableRadius? Stellar radius from MK and Baraffe et al. (2015A&A...577A..42B) modelssolRadpos.angDistancefloatnullableProtRotation period, truncated to the 6th decimal figure (1)dmeta.bib.figdoublel_vsini[0/2] Upper or lower-limit flag on vsini (1)(4)meta.code.error;phys.veloc.rotatintvsiniProjected equatorial rotation velocity (1)km/sphys.veloc.rotatfloatseqRotational sequencephyscharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from Hartman et al., 2010, Cat. J/MNRAS/408/475 (right ascension part)degpos.eq.ra;meta.main_DEPositions from Hartman et al., 2010, Cat. J/MNRAS/408/475 (declination part)degpos.eq.dec;meta.main