@Article{BotelhoMiMeAlSpBe:2020:CoChEv,
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
Sun.",
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 = "13 jun. 2024"
}