论文标题
碳，同位素比$^{12} $ C/$^{13} $ c和太阳能双胞胎中的氮：当地光盘的化学演化的约束
Carbon, isotopic ratio $^{12}$C/$^{13}$C and nitrogen in solar twins: constraints for the chemical evolution of the local disc
论文作者
论文摘要
不同年龄的矮星中的光元素的丰度是恒星产量，银河化学演化和系系化学成分研究的重要限制。我们已经测量了C和N的丰度以及$^{12} $ C/$^{13} $ c的比率，用于基于CH \ \ a-X和CN \，使用HARPS特征的CH \，A-X和CN \，B-X的综合列表的光谱综合的63个太阳能双胞胎的年龄范围。对55个薄圆盘太阳能双胞胎的分析证实了[C/Fe]和[N/Fe]对[Fe/H]的依赖性。 [N/Fe]是这些恒星首次研究[Fe/H]的函数，并且是第一次。我们得出的相关性[C/Fe] -Age与太阳能恒星和太阳能双胞胎的作品一致，但是[N/Fe] - 年龄相关性却不一致。太阳能双胞胎的关系[c，n/fe] - [fe/h]和[C，n/fe] age。 $^{12} $ c/$^{13} $ c与[fe/h]相关，并且似乎随着局部薄盘的演变而减少。来自化学进化模型的太阳附近的预测证实了[C，N/Fe] - [Fe/H]，$^{12} $ C/$ c/$^{13} $ C-age和[n/o] - [o/h] - 但不适合$^{12} $ C/$ C/$ C/$^{13} $ C- {13} $ C- [Fe/H]和[C-]和[C-]和[C-]太阳中的N/O比位于太阳能双胞胎均匀分布的高端，这表明N-O预算的统一性是冰冷的行星，水性的超产星和巨型行星的形成。 C和N沿薄圆盘演化具有不同的核合成起源，如[C/N]，[C/O]和[N/O]与[O/H]和年龄的关系所示。 [C/N]和[C/O]在太阳能双胞胎中的时间增加了，而太阳能双胞胎的时间增加了。
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 $^{12}$C/$^{13}$C ratios for a sample of 63 solar twins spanning a wide range in age, based on spectral synthesis of a comprehensive list of CH\,A-X and CN\,B-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. $^{12}$C/$^{13}$C 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], $^{12}$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 the homogeneous distribution of solar twins, which suggests uniformity in the N-O budget for the formation of icy planetesimals, watery super-earths 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.
