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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Botelho, R. B. [1] ; Milone, A. de C. [1] ; Melendez, J. [2] ; Alves-Brito, A. [3] ; Spina, L. [4, 5] ; Bean, J. L. [6]
Total Authors: 6
Affiliation:
[1] Inst Nacl Pesquisas Espaciais, Div Astrofis, Av Astronautas 1758, BR-12227010 Sao Jose Dos Campos, SP - Brazil
[2] Univ Sao Paulo, IAG, Dept Astron, Rua Matao 1226, BR-05509900 Sao Paulo, SP - Brazil
[3] Univ Fed Rio Grande do Sul, Inst Fis, Av Bento Goncalves 9500, BR-91501970 Porto Alegre, RS - Brazil
[4] Monash Univ, Sch Phys & Astron, Monash Ctr Astrophys, Clayton, Vic 3800 - Australia
[5] ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Clayton, Vic - Australia
[6] Univ Chicago, Dept Astron & Astrophys, 5640 S Ellis Ave, Chicago, IL 60637 - USA
Total Affiliations: 6
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 499, n. 2, p. 2196-2213, DEC 2020.
Web of Science Citations: 0
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. (AU)

FAPESP's process: 18/04055-8 - High precision spectroscopy: from the first stars to planets
Grantee:Jorge Luis Melendez Moreno
Support Opportunities: Research Projects - Thematic Grants