利用太阳双胞胎研究银河薄盘的化学演变

IF 5.4 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Astronomy & Astrophysics Pub Date : 2024-11-21 DOI:10.1051/0004-6361/202451167
A. Plotnikova, L. Spina, B. Ratcliffe, G. Casali, G. Carraro
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摘要

在这项研究中,我们探讨了年龄-金属性关系(AMR)是否偏离了预期的金属性随年龄平稳增长的趋势。我们还利用一个相对较小的数据集展示了最近声称的两个种群的存在(或不存在)。此外,我们还利用太阳双胞胎研究了银河薄盘的化学演化,包括径向迁移和吸积事件的影响。特别是,我们利用太阳双星大样本的高分辨率光谱和精确的年龄测定,研究了银河薄盘年龄-金属性的关系。此外,我们还得出了恒星的诞生半径,并研究了薄盘的化学演化。我们发现统计和选择偏差会导致对观测数据的误读。通过对所有不确定性的精确计算,我们发现围绕太阳的太阳双星(-0.3 < [Fe/H] < 0.3 dex)在AMR中并没有分成不同的群体。这使我们得出结论:薄圆盘的形成相对平稳。对于银河系薄盘形成的主要情况,我们认为,太阳周围达到今天化学成分的主要机制是径向迁移,同时也可能有著名的吸积事件的贡献,如盖亚-恩克拉多斯/香肠(GES)和人马座(Sgr)。
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The chemical evolution of the Milky Way thin disk using solar twins
Aims. In this study we address whether the age-metallicity relation (AMR) deviates from the expected trend of metallicity increasing smoothly with age. We also show the presence (or absence) of two populations, as recently claimed using a relatively small dataset. Moreover, we studied the Milky Way thin disk’s chemical evolution using solar twins, including the effect of radial migration and accretion events.Methods. In particular, we exploited high-resolution spectroscopy of a large sample of solar twins in tandem with an accurate age determination to investigate the Milky Way thin disk age-metallicity relationship. Additionally, we derived the stars’ birth radius and studied the chemical evolution of the thin disk.Results. We discovered that statistical and selection biases can lead to a misinterpretation of the observational data. An accurate accounting of all the uncertainties led us to detect no separation in the AMR into different populations for solar twins around the Sun (−0.3 < [Fe/H] < 0.3 dex). This lead us to the conclusion that the thin disk was formed relatively smoothly. For the main scenario of the Milky Way thin disk formation, we suggest that the main mechanism for reaching today’s chemical composition around the Sun is radial migration with the possible contribution of well-known accretion events such as Gaia-Enceladus/Sausage (GES) and Sagittarius (Sgr).
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来源期刊
Astronomy & Astrophysics
Astronomy & Astrophysics 地学天文-天文与天体物理
CiteScore
10.20
自引率
27.70%
发文量
2105
审稿时长
1-2 weeks
期刊介绍: Astronomy & Astrophysics is an international Journal that publishes papers on all aspects of astronomy and astrophysics (theoretical, observational, and instrumental) independently of the techniques used to obtain the results.
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