author = "Botelho, Rafael Bueno and Milone, Andr{\'e} de Castro and 
                         Melendez, J. and Alves Brito, A. and Spina, L. and Bean, J. L.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Universidade de 
                         S{\~a}o Paulo (USP)} and {Universidade Federal do Rio Grande do 
                         Sul (UFRGS)} and {Monash University} and {University of Chicago}",
                title = "Carbon, isotopic ratio C-12/C-13, and nitrogen in solar twins: 
                         constraints for the chemical evolution of the local disc",
              journal = "Monthly Notices of the Royal Astronomical Society",
                 year = "2020",
               volume = "499",
               number = "2",
                pages = "2196--2213",
                month = "Dec.",
             keywords = "planets and satellites: formation, stars: abundance, stars: 
                         fundamental parameters, stars: solar-type, Galaxy: evolution, 
                         solar neighbourhood.",
             abstract = "Abundances of light elements in dwarf stars of different ages are 
                         important constraints for stellar yields, Galactic chemical 
                         evolution and exoplanet chemical composition studies. We have 
                         measured C and N abundances and C-12/C-13 ratios for a sample of 
                         63 solar twins spanning a wide range in age, based on spectral 
                         synthesis of a comprehensive list of CHA-X and CNB-X features 
                         using HARPS spectra. The analysis of 55 thin disc solar twins 
                         confirms the dependences of [C/Fe] and [N/Fe] on [Fe/H]. [N/Fe] is 
                         investigated as a function of [Fe/H] and age for the first time 
                         for these stars. Our derived correlation [C/Fe]-age agrees with 
                         works for solar-type stars and solar twins, but the [N/Fe]-age 
                         correlation does not. The relations [C,N/Fe]-[Fe/H] and 
                         [C,N/Fe]-age for the solar twins lay under solar. C-12/C-13 is 
                         found correlated with [Fe/H] and seems to have decreased along the 
                         evolution of the local thin disc. Predictions from chemical 
                         evolution models for the solar vicinity corroborate the relations 
                         [C,N/Fe]-[Fe/H], C-12/C-13-age, and [N/O]-[O/H], but do not for 
                         the C-12/C-13-[Fe/H] and [C/O]-[O/H] relations. The N/O ratio in 
                         the Sun is placed at the high end of the homogeneous distribution 
                         of solar twins, which suggests uniformity in the N-O budget for 
                         the formation of icy planetesimals, watery superearths, and giant 
                         planets. C and N had different nucleosynthetic origins along the 
                         thin disc evolution, as shown by the relations of [C/N], [C/O], 
                         and [N/O] against [O/H] and age. [C/N] and [C/O] are particularly 
                         observed increasing in time for solar twins younger than the 
                  doi = "10.1093/mnras/staa2917",
                  url = "http://dx.doi.org/10.1093/mnras/staa2917",
                 issn = "0035-8711 and 1365-2966",
             language = "en",
           targetfile = "botelho_carbon.pdf",
        urlaccessdate = "12 abr. 2021"