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oapen-20.500.12657-556872022-06-01T03:49:00Z Isotopic fractionation study towards massive star-forming regions across the Galaxy Colzi, Laura astrochemistry stars: formation ISM: molecules nuclear reactions nucleosynthesis abundances Galaxy: evolution methods: numerical bic Book Industry Communication::P Mathematics & science::PG Astronomy, space & time bic Book Industry Communication::P Mathematics & science::PG Astronomy, space & time::PGC Theoretical & mathematical astronomy bic Book Industry Communication::P Mathematics & science::PH Physics::PHV Applied physics 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. 2022-05-31T10:37:29Z 2022-05-31T10:37:29Z 2021 book ONIX_20220531_9788855183802_971 2612-8020 9788855183802 9788855183796 9788855183819 https://library.oapen.org/handle/20.500.12657/55687 eng Premio Tesi di Dottorato application/pdf Attribution 4.0 International 9788855183802.pdf https://books.fupress.com/isbn/9788855183802 Firenze University Press 10.36253/978-88-5518-380-2 10.36253/978-88-5518-380-2 bf65d21a-78e5-4ba2-983a-dbfa90962870 9788855183802 9788855183796 9788855183819 91 230 Florence open access
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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.
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