English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Abundances of light elements in dwarf stars of different ages are importantconstraints for stellar yields, Galactic chemical evolution and exoplanetchemical composition studies. We have measured C and N abundances and$^{12}$C/$^{13}$C ratios for a sample of 63 solar twins spanning a wide rangein age, based on spectral synthesis of a comprehensive list of CH\,A-X andCN\,B-X features using HARPS spectra. The analysis of 55 thin disc solar twinsconfirms the dependences of [C/Fe] and [N/Fe] on [Fe/H]. [N/Fe] is investigatedas a function of [Fe/H] and age for the first time for these stars. Our derivedcorrelation [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. $^{12}$C/$^{13}$C is foundcorrelated with [Fe/H] and seems to have decreased along the evolution of thelocal thin disc. Predictions from chemical evolution models for the solarvicinity corroborate the relations [C,N/Fe]-[Fe/H], $^{12}$C/$^{13}$C-age and[N/O]-[O/H], but do not for the $^{12}$C/$^{13}$C-[Fe/H] and [C/O]-[O/H]relations. The N/O ratio in the Sun is placed at the high end of thehomogeneous distribution of solar twins, which suggests uniformity in the N-Obudget for the formation of icy planetesimals, watery super-earths and giantplanets. C and N had different nucleosynthetic origins along the thin discevolution, 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 solartwins younger than the Sun.

Carbon, isotopic ratio $^{12}$C/$^{13}$C and nitrogen in solar twins: constraints for the chemical evolution of the local disc