02144nam 2200385 450 991057218090332120230517105145.0(CKB)5860000000047692(NjHacI)995860000000047692(EXLCZ)99586000000004769220230517d2021 uy 0engur|||||||||||txtrdacontentcrdamediacrrdacarrierIsotopic fractionation study towards massive star-forming regions across the Galaxy /Laura ColziFirenze, Italy :Firenze University Press,[2021]©20211 online resource (226 pages) illustrationsPremio tesi di dottorato ;Volume 9188-5518-381-8 Includes bibliographical references.One of the most important tools to investigate the chemical history of our Galaxy and our own Solar System is to measure the isotopic fractionation of chemical elements. In the present study new astronomical observations devoted to the study of hydrogen and nitrogen fractionation (D/H and 14N/15N ratios) of molecules, towards massive star-forming regions in different evolutionary phases, have been presented. Moreover, a new detailed theoretical study of carbon fractionation, 12C/13C ratios, has been done. One of the main results was the confirmation that the 14N/15N ratio increases with the galactocentric distance, as predicted by stellar nucleosynthesis Galactic chemical evolution models. This work gives new important inputs on the understanding of local chemical processes that favor the production of molecules with different isotopes in star-forming regions.Premio Firenze University Press tesi di dottorato (Series) ;Volume 91.StarsFormationStarsFormation.523.88Colzi Laura1349013NjHacINjHaclBOOK9910572180903321Isotopic fractionation study towards massive star-forming regions across the Galaxy3086889UNINA