J/MNRAS/516/3786ivo://CDS.VizieR/J/MNRAS/516/3786doi:10.26093/cds/vizier/bg-g4-3paCDSMishenina T.Pignatari M.Gorbaneva T.Cote B.Yague Lopez A.,Thielemann F.-K.Soubiran C.2026-08-03T07:31:54Z2025-10-07T15:01:08ZCDS support team

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

cds-question@unistra.frgalaxy-planesmilky-way-galaxylate-type-starsspectroscopyvisible-astronomymetallicitychemically-peculiar-starseffective-temperaturegalaxy-kinematicsThe study of the origin of heavy elements is one of the main goals of nuclear astrophysics. In this paper, we present new observational data for the heavy r-process elements gadolinium (Gd, Z= 64), dysprosium (Dy, Z= 66), and thorium (Th, Z= 90) in a sample of 276 Galactic disc stars (-1.0 < [Fe/H] < + 0.3). The stellar spectra have a high resolution of 42000 and 75000, and the signal-to- noise ratio higher than 100. The LTE abundances of Gd, Dy, and Th have been determined by comparing the observed and synthetic spectra for three Gd lines (149 stars), four Dy lines (152 stars), and the Th line at 4019.13 {AA} (170 stars). For about 70 per cent of the stars in our sample, Gd and Dy are measured for the first time, and Th for 95 per cent of the stars. Typical errors vary from 0.07 to 0.16 dex. This paper provides the first extended set of Th observations in the Milky Way disc. Together with europium (Eu, Z= 63) data from our previous studies, we have compared these new observations with nucleosynthesis predictions and Galactic Chemical Evolution simulations. We confirm that [Gd/Fe] and [Dy/Fe] show the same behaviour of Eu. We study with GCE simulations the evolution of [Th/Fe] in comparison with [Eu/Fe], showing that unlike Eu, either the Th production is metallicity dependent in case of a unique source of the r-process in the Galaxy, or the frequency of the Th-rich r-process source is decreasing with the increase in [Fe/H].2022MNRAS.516.3786Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/516/3786CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/340/304 : [X/Fe] of Galactic disc F and G dwarfs (Reddy+, 2003)J/MNRAS/474/2580 : Temporal evolution of neutron-capture elements (Spina+,2018)J/MNRAS/482/1690 : Thorium in solar twins (Botelho+, 2019)J/MNRAS/489/1697 : Galactic disc enrichment with Mo and Ru (Mishenina+, 2019)J/A+A/411/559 : Effective temperature for 181 F-K dwarfs (Kovtyukh+, 2003)J/A+A/418/551 : Galactic disk stars abundances and velocitiesJ/A+A/433/185 : Detailed abundance analysis of 102 F and G dwarfsJ/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)J/A+A/440/1153 : Equivalent widths of 7 thin-disk stars (del Peloso+, 2005)J/A+A/489/923 : Abundances of stars in lower main sequence (Mishenina+,2008)J/A+A/552/A128 : Stellar abundances of neutron-capture elementsJ/A+A/569/A43 : HE 2252-4225 abundance analysis (Mashonkina+, 2014)J/A+A/619/A143 : r-process abundances in AMBRE stars (Guiglion+, 2018)J/A+A/643/A49 : Linelist (Hansen+, 2020)J/ApJ/724/975 : Heavy elements abundances of metal-poor starsJ/ApJ/762/26 : Most metal-poor stars. II. 190 Galactic halo starsJ/ApJ/787/10 : Solar s-process contributions with GCE modelJ/ApJ/858/92 : RPA Southern Pilot Search of 107 Stars (Hansen+, 2018)J/ApJ/868/110 : R-Process Alliance: 1st release in Galactic haloJ/ApJ/870/2 : PUSH CCSN to explosions in spherical symmetry. III.J/ApJ/882/40 : Lanthanide fraction distribution of metal-poor starsJ/ApJ/908/79 : The r-process Alliance; abundances in 519 starsJ/ApJS/237/13 : Models and yields of 13-120M_{sun}_ massive starsJ/AJ/147/136 : Stars of very low metal abundance. VI. Abundanceshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/516/3786https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/516/3786http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/516/3786https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/516/3786https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/516/3786http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/516/3786GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/516/3786/tablea1 (Stellar parameters and Gd, Dy, and Th abundances with the std from line-to-line abund variation)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/516/3786/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/516/3786/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/516/3786/tablea1?GETtext/xml+votable180.050000true1.653266729.02150360.0055555555555555566/49 60 100 137 237 309 377 455 684 742 819 918 987 1028 1084 1247 1330 1341 1530 1728 1827 1875 2167 2169 2317 2366 2472 2476 2491 2622 2652 2697 2923 3020 3102 3258 3313 3372 3509 3639 3662 3683 3691 3780 3786 3809 3979 4079 4241 4278 4591 4735 4762 4942 5009 5304 5309 5413 5498 5522 5726 5824 5932 6025 6217 6226 6273 6287 6385 6398 6409 6523 6662 6766 6926 6953 7354 7443 7763 8094 8224 8357 8466 8663 8995 9072 9476 9492 9662 9679 9801 9843 9873 10004 10062 10325 10375 10518 10812 10899 10914 11126 11142 11150 11165 11633 11713 11806 11834 12228 12282 12388 12494 12592 12654 12704 12856 12890 12944 12983 13036 13075 13164 13478 13487 13547 13568 13749 13763 13769 13778 13791 14131 14180 14252 14278 14290 14342 14419 14426 14502 14534 14539 14650 15030 15044 15107 15174 15221 15227 15373 15722 15727 16031 16069 16144 16220 16252 16342 16883 17219 17768 18115 18139 18184 18615 19132 19181 19219 19327 19836 19912 19923 20127 20145 20278 20328 20402 21177 21484 21726 21838 21858 21901 21953 22040 22157 22340 22354-22355 22654 22818 23096 23190 23230 23271 23284 23342 23515 23575 23583 23600 23624 23661 23774 23938 23960 24016 24028 24036 24151 24536 25444 25766 25846 25862 25966 26379 26468 26521 26575 26975 27124 27254 27374 27462 27712 28122 28400 28494 29675 30049 30123 30127 30166 30176 30206 30540 30658 30878 30965 31101 31130 31145 31172 31204 31393 31399 31425 31433 31478 31751 31768 31796 31848 31874 31920 32001 32067 32211 32224 32509 32561 32619 32757 36664 36697 40716 40823 40932 44284 49114https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/516/3786?format=asciiOpticaldefaultJ/MNRAS/516/3786/tablea1Stellar parameters and Gd, Dy, and Th abundances with the std from line-to-line abund variationn_NameGalactic location name (1)meta.notecharVtMicro-turbulent velocity (V_t_)km/sphys.veloc.microTurb;meta.modelledfloat[Gd/Fe]? Gadolinium heavy r-process element to iron abundance ratio ([Gd/Fe])log(Sun)phys.abund;arith.ratio;meta.modelledfloatnullables_[Gd/Fe]? Standard deviation of [Gd/Fe] (Standard_deviation_[Gd/Fe])log(Sun)stat.stdev;phys.abund;meta.modelledfloatnullable[Dy/Fe]? Dysprosium heavy r-process element to iron abundance ratio ([Dy/Fe])log(Sun)phys.abund;arith.ratio;meta.modelledfloatnullables_[Dy/Fe]? Standard deviation of [Dy/Fe] (Standard_deviation_[Dy/Fe])log(Sun)stat.stdev;phys.abund;meta.modelledfloatnullable[Th/Fe]? Thorium heavy r-process element to iron abundance ratio ([Th/Fe])log(Sun)phys.abund;arith.ratio;meta.modelledfloatnullableSimbadNameSimbad column added by the CDSmeta.idcharnullable_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.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameHD/BD star name number (HD/BD)meta.id;meta.maincharTeffEffective temperature from Mishenina et al. 2013A&A...552A.128M, Cat. J/A+A/552/A128 (T_eff_)Kphys.temperature.effectiveintloggLogarithm of surface gravity from Mishenina et al. 2013A&A...552A.128M, Cat. J/A+A/552/A128 (logg)log(cm.s**-2)phys.gravityfloat[Fe/H]Iron to hydrogen abundance ratio from Mishenina et al. 2013A&A...552A.128M, Cat. J/A+A/552/A128 ([Fe/H])log(Sun)phys.abund.Fe;arith.ratiofloat