J/A+A/348/897ivo://CDS.VizieR/J/A+A/348/897doi:10.26093/cds/vizier.33480897CDSLachaume R.Dominik C.Lanz T.Habing H.J.2017-10-03T05:12:41Z2009-06-03T08:41:22ZCDS support team

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

cds-question@unistra.frdwarf-starsstellar-agesmetallicityWe have determined the age of a sample of nearby main-sequence stars with spectral types B9-K9. We have derived the stellar ages from five different age estimators: the location in the HR diagram compared to theoretical isochrones, the rotational velocity, the strength of chromospheric calcium emission lines, the stellar metallicity, and their space velocity. New calibrations consistent with recent theoretical isochrones are provided for the last four indicators. For hot stars, isochrones are the best indicator, while stellar rotation is best for cool stars. However, many stars require in fact a combination of different methods to properly bracket their actual age. We also discuss the uncertainties involved, in particular those in using isochrones, and we find that these uncertainties are often underestimated in the literature.1999A&A...348..897Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/348/897CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/329/943 : F + G solar neighbourhood stars new ages (Ng+ 1998)J/MNRAS/298/332 : Chromospheric activity-age relation (Rocha-Pinto+ 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/348/897https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/348/897http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/348/897https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/348/897https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/348/897http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/348/897GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/348/897/tablea6 (Final ages)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/348/897/tablea6?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/348/897/tablea6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/348/897/tablea6?GETtext/xml+votable180.050000true2.8160719-15.46797750.0055555555555555566/1341 1875 2472 3102 3639 4854 5009 5522 5836 5853 6066 8476 8843 8985 9125 9476 9835 10375 11193 11403 14278 14906 15170 15583 16069 17171 17425 17576 18139 19585 20145 20940 21060 21177 21289 22040 22300 22708 23190 23230 24713 24924 25766 26521 26575 26975 27268 27884 27975 28352 28605 29196 29212 30543 30965 31087 32192 32757 33211 33351 33490 33552 33717 33849 34054 34817 35064 35079 35327 36365 36379 36664 37408 38238 39284 40932 41687 41759 42248 42555 42845 45485 45564 46281 46640 46939 47589 48355 48652https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/348/897?format=asciiOpticaldefaultJ/A+A/348/897/tablea1Ages from Bertelli's isochronesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD (Cat. <III/135>) numbermeta.id;meta.mainintTeffEffective temperatureKphys.temperature.effectiveint[Fe/H]Metallicitylog(Sun)phys.abund.ZfloatVMAGAbsolute V magnitudemagphys.magAbs;em.opt.VfloatlogLowAge? Low isochronic agelog(yr)time.agefloatnullablen_logLowAgeNote on undetermination of logLowAge (1)meta.notecharlogMedAge? Medium isochronic agelog(yr)time.agefloatnullablen_logMedAgeNote on undetermination of logMedAge (1)meta.notecharlogUppAge? Upper isochronic agelog(yr)time.age;stat.maxfloatnullablen_logUppAgeNote on undetermination of logUppAge (1)meta.notecharRefReference (2)meta.ref;pos.framecharJ/A+A/348/897/tablea2Rotational agesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD (Cat. <III/135>) numbermeta.id;meta.mainintPerPeriod of rotationdtime.periodfloatB-VB-V colour indexmagphot.color;em.opt.B;em.opt.Vfloat[Fe/H]Metallicitylog(Sun)phys.abund.ZfloatLowAgeLow rotational agelog(yr)time.agefloatMedAgeMedium rotational agelog(yr)time.agefloatn_MedAge[*] *: Age overestimatedmeta.notecharUppAgeUpper rotational agelog(yr)time.age;stat.maxfloatr_[Fe/H]Reference for [Fe/H] (1)meta.refcharr_PerReference for Per (2)meta.ref;pos.framecharJ/A+A/348/897/tablea3Calcium agesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD (Cat. <III/135>) numbermeta.id;meta.mainintlogR'HKStrength of chromospheric calcium emission lines (1)spect.indexfloatr_logR'HKReference for logR'HK (2)meta.ref;pos.framecharlogAgeAgelog(yr)time.agefloatJ/A+A/348/897/tablea4Kinetic agesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD (Cat. <III/135>) numbermeta.id;meta.mainintUvelU space velocitykm/sphys.veloc;pos.cartesian.xfloatVvelV space velocitykm/sphys.veloc;pos.cartesian.yfloatWvelW space velocitykm/sphys.veloc;pos.cartesian.zfloatl_logAgeLimit flag on logAgemeta.code.error;time.agecharlogAgeAgelog(yr)time.agefloatr_logAgeParameter used for age determination (1)meta.ref;pos.framecharJ/A+A/348/897/tablea5Metallicity datationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD (Cat. <III/135>) numbermeta.id;meta.mainint[Fe/H]Metallicitylog(Sun)phys.abund.Zfloatr_[Fe/H]Reference for [Fe/H] (1)meta.refcharl_logAgeLimit flag on logAgemeta.code.error;time.agecharlogAge? Agelog(yr)time.agefloatnullablen_logAge[?] ? when not determinedmeta.notecharJ/A+A/348/897/tablea6Final agesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD (Cat. <III/135>) numbermeta.id;meta.mainintprimarylogMinAge? Minimum agelog(yr)time.age;stat.minfloatnullableu_logMinAge[?)] ?: value not determined ): uncertain valuemeta.code.errorcharlogMedAge? Medium agelog(yr)time.agefloatnullableu_logMedAge[?)] ?: value not determined ): uncertain valuemeta.code.errorcharlogUppAge? Upper agelog(yr)time.age;stat.maxfloatnullableu_logUppAge[?] ?: value not determinedmeta.code.errorcharn_logMinAgeMethod used for Minimum age determination (1)meta.notecharn_logMedAgeMethod used for Medium age determination (1)meta.notecharn_logUppAgeMethod used for Upper age determination (1)meta.notecharSimbadSimbad column added by the CDSchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main