MILAKOVIC, DinkoDinkoMILAKOVICWebb, John K.John K.WebbMOLARO, PaoloPaoloMOLAROLee, Chung ChiChung ChiLeeJethwa, PrashinPrashinJethwaCUPANI, GuidoGuidoCUPANIMurphy, Michael T.Michael T.MurphyWELSH, Louise AmberLouise AmberWELSHD'ODORICO, ValentinaValentinaD'ODORICOCRISTIANI, StefanoStefanoCRISTIANISantos, Ricardo GénovaRicardo GénovaSantosMartins, Carlos J.A.P.Carlos J.A.P.MartinsNunes, Nelson J.Nelson J.NunesSCHMIDT, TOBIAS MARIUSTOBIAS MARIUSSCHMIDTPepe, Francesco A.Francesco A.PepeOsorio, Maria Rosa ZapateroMaria Rosa ZapateroOsorioAlibert, YannYannAlibertGonzález Hernández, J. I.J. I.González HernándezDI MARCANTONIO, PaoloPaoloDI MARCANTONIOPalle, EnricEnricPalleRebolo, RafaelRafaelReboloSantos, Nuno C.Nuno C.SantosSousa, Sergio G.Sergio G.SousaMascareño, Alejandro SúarezAlejandro SúarezMascareño2024-12-102024-12-1020240035-8711http://hdl.handle.net/20.500.12386/35444Chemical evolution models predict a gradual build-up of 13 C in the Universe, based on empirical nuclear reaction rates and assumptions on the properties of stellar populations. Ho we ver, old metal-poor stars within the Galaxy contain more 13 C than is predicted, suggesting that further refinements to the models are necessary. Gas at high-redshift provides important supplementary information at metallicities -2 ≲ [ Fe / H ] ≲ -1, for which there are only a few measurements in the Galaxy. We obtained new, high-quality, VLT/ESPRESSO observations of the QSO B1331 + 170 and used them to measure 12 C/ 13 C in the damped Lyman- αsystem (DLA) at z abs = 1 . 776, with [ Fe / H ] = -1.27. AI-VPFIT , an artificial intelligence tool based on genetic algorithms and guided by a spectroscopic information criterion, was used to explore different possible kinematic structures of the carbon gas. Three hundred independent AI-VPFIT models of the absorption system were produced using pre-set 12 C/ 13 C values, ranging from 4 to 500. Our results show that 12 C/ 13 C = 28 . 5 + 51 . 5 -10 . 4 , suggesting a possibility of 13 C production at low metallicity.STAMPAenArticle10.1093/mnras/stae20562-s2.0-85204100986https://academic.oup.com/mnras/article/534/1/12/7754833https://api.elsevier.com/content/abstract/scopus_id/85204100986FIS/05 - ASTRONOMIA E ASTROFISICA