J/A+A/624/A78ivo://CDS.VizieR/J/A+A/624/A78doi:10.26093/cds/vizier.36240078CDSDelgado Mena E.Moya A.Adibekyan V.Tsantaki M.,Gonzalez Hernandez J.I.Israelian G.Davies G.R.Chaplin W.J.,Sousa S.G.Ferreira A.Santos N.C.2019-05-06T15:34:49Z2019-04-23T08:41:40ZCDS support team

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

cds-question@unistra.frmultiple-starsstellar-massesstellar-agesvisible-astronomytrigonometric-parallaxThe purpose of this work is to evaluate how several elements produced by different nucleosynthesis processes behave with stellar age and provide empirical relations to derive stellar ages from chemical abundances. We derived different sets of ages using Padova and Yonsei-Yale isochrones and Hipparcos and Gaia parallaxes for a sample of more than 1000 FGK dwarf stars for which he have high-resolution R~115000 and high-quality spectra from the HARPS-GTO program. We analyzed the temporal evolution of different abundance ratios to find the best chemical clocks. We applied multivariable linear regressions to our sample of stars with a small uncertainty on age to obtain empirical relations of age as a function of stellar parameters and different chemical clocks. We find that [alpha/Fe] ratio (average of Mg, Si, and Ti), [O/Fe] and [Zn/Fe] are good age proxies with a lower dispersion than the age-metallicity dispersion. Several abundance ratios present a significant correlation with age for chemically separated thin disk stars (i.e., low-alpha) but in the case of the chemically defined thick disk stars (i.e., high-alpha) only the elements Mg, Si, Ca, and TiII show a clear correlation with age. We find that the thick disk stars are more enriched in light-s elements than thin disk stars of similar age. The maximum enrichment of s-process elements in the thin disk occurs in the youngest stars which in turn have solar metallicity. The slopes of the [X/Fe]-age relations are quite constant for O, Mg, Si, Ti, Zn, Sr, and Eu regardless of the metallicity. However, this is not the case for Al, Ca, Cu and most of the s-process elements, which display very different trends depending on the metallicity. This demonstrates the limitations of using simple linear relations based on certain abundance ratios to obtain ages for stars of different metallicities. Finally, we show that by using 3D relations with a chemical clock and two stellar parameters (either Teff, [Fe/H] or stellar mass) we can explain up to 89% of age variance in a star. A similar result is obtained when using 2D relations with a chemical clock and one stellar parameter, explaining up to a 87% of the variance. The complete understanding of how the chemical elements were produced and evolved in the Galaxy requires the knowledge of stellar ages and precise chemical abundances. We show how the temporal evolution of some chemical species change with metallicity, with remarkable variations at super-solar metallicities, which will help to better constrain the yields of different nucleosynthesis processes along the history of the Galaxy.2019A&A...624A..78Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/624/A78CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)J/A+A/487/373 : Spectroscopic parameters of 451 HARPS-GTO stars (Sousa+, 2008)J/A+A/512/A48 : HD125612, HD215497, HIP5158 HARPS RV curves (Lo Curto+, 2010)J/A+A/526/A99 : Metal-poor solar-type stars spectroscopy & massesJ/A+A/526/A112 : Radial velocities of HARPS metal-poor sample (Santos+, 2011)J/A+A/533/A141 : Stellar parameters for 582 HARPS FGK stars (Sousa+, 2011)J/A+A/555/A150 : Physical parameters of cool solar-type stars (Tsantaki+, 2013)J/A+A/606/A94 : Chemical abundances of 1059 FGK stars (Delgado Mena+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/624/A78https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/624/A78http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/624/A78https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/624/A78https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/624/A78http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/624/A78GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/624/A78/table2 (Stellar masses and ages)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/624/A78/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/624/A78/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/624/A78/table2?GETtext/xml+votable180.050000true117.7639381-50.30500220.0055555555555555566/8235 8296 12424 12644 16408 16502 16511 16514 16518 16528 16533 16543 16603 16639 16649 16652 16682 16707 16776 16837 16841 16855 16874 16883 16890 16931 16986 16988 17011 17035 17047 17097 17177 17187 17206 17209 17218 17249 17266 17284 17314 17341 17353 17358 17374 17419 17425 17435 17453 17480 17496 17529 17540 17587 17641 17657 17662 17671 17685 17714 17730 17734 17744 17768 17804 17944 17954 17970 17993 18005 18067 18466 18548 18614-18615 18637 18641 18643 18711 18772 18785 18792 18835 18838 18963 19003 19072 19108 19217 19466 20492 20495 20522 20557 20582 20593 20621 20638 20640 20661 20712 20746 20766 20772 20873 21066 21080 21110 21117 21121 21194 21211 21213 21317 21326 21399-21400 21412 21477 21484 21516 21550-21551 21600 21691 21696 21715 21774 21779 21809 21838 21906 21912 21989 22036 22118 22159 22162 22545 22579 22590 22606 22608 22613 22619 22630 22684 22708 22724 22734 22746 22760 22813 22837 22843 23061 23066 23084 23096-23097 23123 23138 23177 23187 23201 24695 24718 24729 24759 24769 24775 24791 24809 24816 24831 24850 24853 24876 24924-24925 25015 25078 25102 25136 25224-25225 25233 25241 25258 25279 25349 25424 25512 25527 25538 25545 25567 25578 25584 25593 25622 25636 25669 25702 25756 25773 25820 25826 25862 25880 25889 25906 25939 25981 26126 26128 26142 26183 26242 26256 26305 26626 26636 26652 26655 26680 26743 26768 26780 26790 26796 26812 26828 26888 26901 26906 26934 26961 27018-27019 27021 27030 27040 27255 27661 27741 28703 28719 28763-28764 28843 28854 28874 28887 28894 28919 28961 29107 29143 29146 29236 29238 29289 29295 29349 29410 29418 29461 29513 29515 29521 29563 29565 29595-29596 29598 29675 29688 29756 29833 29838 29842 29900 29928 29974 30233 30310 30343 30720 30789 30825 30848 30862 30864 30878 30890 30919 30939 30943 30951 31011 31015 31027 31029 31037 31039 31254 31380 31393 31480 31503 31650 31813 32787 32836 32838 32848 32912 32915 32930 32986 32993 32998 33020 33063 33082 33086 33091 33122 33160 33179 33182 33204 33210 33212 33214 33219 33243 33273 33357 33361 33400 33418 33421 33427 33430 33442 33456 33510 33552 33555 33571 33590 33608 33630 33649 33662 33685 33705 33709 33717 33782 33813 33871 33879 33890 33923 33945 33949 33963 33974 34039 34060 34064 34102 34119 34128 34164 34172-34173 34192 34199 34204 34219 34290 34306 34308 34336 34350 34372 34408 34442 34446 34497 34515-34516 34519 34530 34536 34564 34577 34618 34638 34673-34674 34684 34686 34695 34744 34807 34817 34856 34864 34905 34947 34951 34953 34966 34983 35017 35027 35036 35074 35121 35152 35174 35202 35214 35228 35230 35288 35291 35339 35347 35362 35392 35415 35440 35468 35502 35533 35590 35691 35733 35776 35779 35781 35784 35786 35790 35811 35831 35855 35858 35885 35896 35907 35928 35954 35966 35968-35969 35985 35994 36008 36014-36015 36019 36025 36089 36115 36133 36238 36285 36288 36360 36418 36453 36492 36540-36542 36590 36635 36693 36697 36723 36726 36772 36784 36800 36813 36825 36926 36971 36977 37018 37049 37074 37094 37130 37134 37164 37208 37222 37232 37252 37306 37308 37357 37383 37397 37419 37422 37449 37501 37573 37583 37595 37660 37668 37679 37789 37797 37807-37808 37831-37832 37841 37922 37944 37954-37955 37995 38055 38065 38099 38120 38138 38149 38162 38216 38219 38229 38238 38279 38283 38288 38311 38339 38349 38378 38414 38433-38434 38443 38461-38462 38521 38545 38562 38566 38605 38698 38728 38734 38738 38742 38788 38792 38807 38813 38834 38836-38837 38857 38870 38905 38934 38936 38944 38955 38960 38971 38975 38986 38998 39006 39030 39034 39074 39093 39110 39149 39176 39200 39219 39257 39282-39283 39298 39314 39316 39321 39364 39377 39402 39404 39422 39461 39576 39584 39600 39688 39691 39733 39767 39775 39854 39859 39877 39888 39915 39920 39984 40007 40019 40058 40066 40078 40101 40105 40197 40302 40317 40415 40442 40453 40480 40514 40590 40662 40686-40687 40692 40722 40749 40802 40833 40853-40854 40864 40921 40931-40932 40938 40965 40970-40971 40985 40988 41016 41023 41058 41094 41107 41112 41127 41143 41167 41175 41204 41212 41255 41355 41407 41443 41459-41460 41463 41515 41521 41524 41533 41564 41590-41591 41607 41611-41612 41671 41687 41723-41724 41752 41755 41853 41861 41899 41912-41913 41941 41949 41954 41969 42003 42006 42022 42146 42157 42166 42171 42179 42197 42200 42221 42248 42281 42300 42318 42326 42333 42343 42379 42386 42448 42460 42479 42486 42501 42510 42595 42602 42632 42662 42700 42759-42760 42769 42814 42828 42845 42860 42891-42892 42906 42918 42928 42934 42965 43001 43012 43067-43068 43171 43177 43228 43258 43267 43280 43287 43290 43306 43310 43315 43321 43345 43374 43544 43558 43567 43569 43577 43610 43612 43639 43641 43649 43670 43672 43676 43680 43724 43760 43771 43778 43781 43800-43801 43813 43818 43911 43928 43944 43954 43977 44005 44054 44115 44131 44150-44151 44208 44243 44260 44262 44287 44315 44340 44347 44355 44359 44374 44398 44600 44608 44637-44638 44653 44683 44740 44792 44812 44816 44879 44884 44887 44910 44918 44937 44951 45021 45034 45121 45124 45143 45168 45182 45204 45228 45237 45245 45261 45265 45299 45309 45334 45337 45376 45378 45386 45391 45412 45420 45422 45430 45446 45457 45502 45511 45539 45559 45564 45589 45627 45640-45641 45656 45668-45669 45682 45687 45706 45717 45721 45752 45754 45758 45792 45823 45837 45853 45865 45892 45902 45907 45917 45924 45948 45974 46019 46053 46076 46080 46084 46111-46112 46135 46170-46172 46193 46203 46234 46247-46249 46271 46274 46287 46297 46306 46333 46352 46355 46357 46494 46511 46526 46558-46559 46639-46640 46664 46681 46685 46687 46705 46713 46728 46734 46768 46776 46800 46805 46829 46874 46936 46944 46967 46971 46978 46983 46997 47004 47020 47022 47030 47045 47061 47065 47073 47077 47137 47157 47184 47198 47253 47308 47364 47377 47387 47390 47407 47510 47567 47575 47590 47600 47629 47647 47655 47674 47712 47740 47780 47795 47858 47898 47903 47930 48014 48022 48050 48105 48113 48172 48177 48182 48205 48260 48282 48335 48345 48350 48361-48362 48402 48478 48490 48513 48519 48530 48545 48581 48583 48607 48652 48664 48679 48705 48707 48727 48731 48736 48792 48821 48846 48865 48870-48871 48882 48943 48980 49001 49028 49036 49042 49060 49064 49097 49114 491283.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/624/A78?format=asciiOpticaldefaultJ/A+A/624/A78/table2Stellar masses and agesSimbadNameSimbad column added by the CDSmeta.idcharPlxGaia DR2 Parallaxmaspos.parallaxfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar's identifiermeta.id;meta.maincharMass? Stellar MasssolMassphys.massfloatnullablee_Mass? Error of Stellar MasssolMassstat.error;phys.massfloatnullableAge? Stellar AgeGyrtime.agefloatnullablee_Age? Error of Stellar AgeGyrstat.error;time.agefloatnullableVmagV magnitudemagphot.mag;em.opt.Vfloate_Plxerror of parallaxmasstat.error;pos.parallaxfloat_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