The AMBRE Project: [Y/Mg] stellar dating calibration with Gaia
The AMBRE Project: [Y/Mg] stellar dating calibration with Gaia
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AMBRE 项目：使用盖亚进行 [Y/Mg] 恒星测年校准
DOI：
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发表时间：
2019
影响因子：
6.5
通讯作者：
G. Guiglion
中科院分区：
文献类型：
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作者：
A. Titarenko;A. Recio;P. Laverny;M. Hayden;G. Guiglion
化学丰度定年方法为研究银河系恒星群的时间演化开辟了新的途径。在本文中，我们使用一个高光谱分辨率的数据库，在太阳附近的关闭星研究的年龄依赖的[Y/Mg]化学丰度比。我们的分析揭示了不同金属丰度的薄盘星的[Y/Mg]和年龄之间的明确相关性，与以前的太阳型恒星的研究协同作用。此外，没有金属丰度与恒星年龄的依赖关系被检测到，使我们能够使用[Y/Mg]比作为一个可靠的年龄代理。最后，[Y/Mg]-年龄关系在9-10 Gyr附近呈现出薄盘星和厚盘星之间的不连续性。对于厚盘星，相关性有一个不同的零点，可能是一个陡峭的趋势与年龄，反映了不同的化学演化历史的两个磁盘组件。
Chemical abundance dating methods open new paths for temporal evolution studies of the Milky Way stellar populations. In this paper, we use a high spectral resolution database of turn-off stars in the solar neighbourhood to study the age dependence of the [Y/Mg] chemical abundance ratio. Our analysis reveals a clear correlation between [Y/Mg] and age for thin disc stars of different metallicities, in synergy with previous studies of solar-type stars. In addition, no metallicity dependence with stellar age is detected, allowing us to use the [Y/Mg] ratio as a reliable age proxy. Finally, the [Y/Mg]–age relation presents a discontinuity between thin and thick disc stars around 9–10 Gyr. For thick disc stars, the correlation has a different zero point and probably a steeper trend with age, reflecting the different chemical evolution histories of the two disc components.