J/MNRAS/298/332ivo://CDS.VizieR/J/MNRAS/298/332doi:10.26093/cds/vizier.72980332CDSRocha-Pinto H.J.Maciel W.J.2024-06-25T20:18:02Z2005-06-16T13:31:16ZCDS support team

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

cds-question@unistra.frlate-type-starsstellar-agesmetallicityWe show that there is a relationship between the age excess, defined as the difference between the stellar isochrone and chromospheric ages, and the metallicity as measured by the index [Fe/H] for late-type dwarfs. The chromospheric age tends to be lower than the isochrone age for metal-poor stars, and the opposite occurs for metal-rich objects. We suggest that this could be an effect of neglecting the metallicity dependence of the calibrated chromospheric emission-age relation. We propose a correction to account for this dependence. We also investigate the metallicity distributions of these stars, and show that there are distinct trends according to the chromospheric activity level. Inactive stars have a metallicity distribution which resembles the metallicity distribution of solar neighbourhood stars, while active stars appear to be concentrated in an activity strip on the log(R'_HK_)*[Fe/H] diagram. We provide some explanations for these trends, and show that the chromospheric emission-age relation probably has different slopes on the two sides of the Vaughan-Preston gap.1998MNRAS.298..332Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/298/332CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/298/332https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/298/332http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/298/332https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/298/332https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/298/332http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/298/332GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/298/332/tablea1 (Stellar data for sample B)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/298/332/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/298/332/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/298/332/tablea1?GETtext/xml+votable180.050000true1.28123-52.1517410.0055555555555555566/100 137 377 944 1808 1875 2476 2622 2923 3036 3639 3691 4278 5009 5498 6226 6308 6339 6409 6501 6523 7763 7803 7868 7907 8094 8109 8239 8663 8848 8995 8999 9354 9492 9662 9801 9843 9873 11128 11142 11405 11412 11472 11510 11713 11732 11746 11856 12146 12204 12268 12592 12846 12890 12944 13025 13763 14426 14502 14539 14662 15030 15132 15727 15800 15883 15962 16408 16422 16440 16448 16463 16518-16519 16532 16577 16652 16679 16912 16930-16931 17219 17425 17486 17606 18139 19424 20328 20548 20557 20600 20621 20633 20640-20641 20653 20665 20746 21060 21177 22708 23190 23230 23661 24028 24536 24558 24585 24620 24633-24634 24713 24729 24731 24736 24769 25102 25966 26462 26575 27255 27374 28244-28245 28605 28675 28696 28715 28719 28760 28815 28841 28868 28875 28960-28961 28987 29190 30419 31101 31130 31411 31768 31785 32372 32561 32596 32757 32800 32802 32812 32848 32921 32930 33042 33082 33160 33201 33224 33252 33338 33357 33416 33419 33435 33447 33454 33456 33510 33552 33568 33590 33608 33629-33630 33684 33697 33717 33756 33788 33818 33854 33879 33907 33945 34040 34069 34074 34096 34111 34119 34126 34130 34141 34164 34199 34219 34270 34282 34338 34372 34379 34390 34426 34442 34446 34499 34530 34562 34586 34597 34626 34638 34671 34754 34788 34817 34825 34836 34848 34896 34904 34924 34947 35036 35051 35079 35121 35189 35191 35201 35230 35336 35339 35349 35351 35415 35423 35468 35485 35497 35506 35525 35552 35603 35675 35750 35784 35852 35858 35880 35896 35954 35993 36031 36035 36115 36365 36664 36693 36697 36954 36971 37021 37059 37088 37094 37186 37408 37479 37595 37607 37616 37637 37665 37679 37704 37711 37732 37807-37808 37831 37890 38099 38159 38235 38238 38270 38279 38311 38330 38333 38339 38341-38342 38382 38414 38421 38433 38562 38565-38566 38570 38581 38592 38598 38601 38614 38625 38691 38706 38734 38742 38788 38790 38807 38814 38834 38932 38946 38950 38955 38964 38966 38975 39025 39028 39034 39040 39059 39074 39109 39141 39213 39215 39225 39227 39256 39263 39282-39284 39306 39321 39362 39377 39386 39403 39422 39461 39463 39469 39487 39500 39557 39562 39566 39576 39614 39646 39674 39693 39727 39730-39731 39735 39767 39781 39808 39813 39824 39841 39851 39854 39861 39888 40000 40021 40030 40054 40078 40101 40105 40453 40968 40981 41055 41062 41089 41094 41163 41194 41221 41225 41259 41336 41379 41412 41441 41446 41453 41460 41463 41468 41562 41568 41570 41588 41590 41607 41610 41612 41625 41708 41721 41724 41752 41853 41861 41912 41935 41941 41969 41990-41991 42009 42042-42044 42063 42070 42102 42146 42150-42151 42156-42157 42171 42174 42200 42203 42221 42228 42248 42252 42281 42287 42317-42318 42355 42360 42423 42426 42431 42448 42460-42461 42463 42468 42515 42588 42601-42602 42622 42656 42706 42710 42724 42760 42769 42794 42808 42845 42857 42860 42864 42869 42874 42887 42890 42911 42918 42933-42934 42955 42979 43012 43017 43072 43136 43167 43209 43228 43258 43282 43290 43315 43318 43331-43332 43362 43430 43540 43544 43555 43639 43649-43650 43655 43668 43687 43698-43699 43710 43714 43724 43738 43782 43797 43804 43813 43844 43902 43911 43944 43977 43989 44045 44054 44078 44115 44131 44180 44183 44195 44221 44226 44228 44284 44292 44549 45065 45107 45111 45121 45135 45137 45143 45175 45182 45238 45241 45253 45265 45299 45337 45343 45345 45360 45378 45388 45396 45458 45472 45527 45535 45541 45551 45564 45621 45627 45641 45653-45654 45668-45669 45673 45687 45770 45811 45865 45888 45917 45927 45948 45956 46056 46076 46080 46100 46112 46115 46129 46135 46170 46172 46191 46193 46208 46234 46248 46297 46306 46320 46325 46355 46472-46473 46482 46501 46523 46526 46593 46626-46627 46640 46654-46655 46681-46682 46685 46708 46734 46777 46790 46800 46820 46874 46910 46916 46923 46925 46944 46967 46991-46992 46998 47001 47027 47045 47073 47127 47133 47137 47149 47205 47213 47234 47274 47279 47287 47311 47360-47361 47377 47409 47429-47430 47461 47502 47543 47550 47576 47584 47590 47629 47702 47706 47710 47730 47740 47745 47824 47842 47858 47894 47903-47904 47910 47930 47935 47945 47949 47953 47975 47985 47991 48007 48014-48015 48022 48176 48182 48223 48230 48259 48277 48283 48291 48305 48394 48664 48672 48705https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/298/332?format=asciidefaultJ/MNRAS/298/332/tablea1Stellar data for sample BrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD (Cat. <III/135>) numberintm_HD[ABC] Multiplicity index on HDcharlogR'HKlogR'_HK_ index (measurement of the chromospheric emission)float[Fe/H]Metallicitylog(Sun)floatlogTeffEffective temperaturelog(K)floatDVMAGDifferential absolute V magnitudemagfloatlogtiso? Isochrone agelog(yr)floatnullablelogtce? Chromospheric age (t_ce_=-1.50logR'_HK_+2.25)log(yr)floatnullableDlogt? Age excess (logtis - logtce)log(yr)floatnullableSimbadSimbad 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