Precise Ages of Field Stars from White Dwarf Companions in Gaia DR2
Precise Ages of Field Stars from White Dwarf Companions in Gaia DR2
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DOI：
10.3847/1538-4365/abe468
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发表时间：
2020-12
期刊：
影响因子：
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通讯作者：
Dan Qiu;H. Tian;Xi-dong Wang;Jiachen Nie;T. Hippel;Gaochao Liu;M. Fouesneau;H. Rix
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文献类型：
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作者：
Dan Qiu;H. Tian;Xi-dong Wang;Jiachen Nie;T. Hippel;Gaochao Liu;M. Fouesneau;H. Rix
我们分析了 4050 个宽双星系统，其中包括一颗白矮星 (WD)，通常还有一颗主序 (MS) 恒星，这些系统是从 Tian 等人收集的大样本中提取的。使用建模代码 BASE-9，我们确定了系统的年龄、WD 祖细胞的零年龄 MS 质量、消光值 (A V ) 和距离模量。忽略年龄收敛性较差的情况，我们获得了 3551 个 WD 的年龄，中位年龄精度为 σ τ /τ = 20%，系统年龄通常在 1-6 Gyr 范围内。我们根据极少数已知星团并通过 236 个 WD-WD 二进制文件的交叉验证来验证这些年龄。假设这些组件在双星系统中是同时存在的，这为通常低质量的 MS 伴星提供了精确的年龄限制，而这些伴星大多是通过任何其他方式无法访问的。
We analyze 4050 wide binary star systems involving a white dwarf (WD) and usually a main-sequence (MS) star, drawn from the large sample assembled by Tian et al. Using the modeling code BASE-9, we determine the system’s ages, the WD progenitors’ zero-age MS masses, the extinction values (A V ), and the distance moduli. Discarding the cases with poor age convergences, we obtain ages for 3551 WDs, with a median age precision of σ τ /τ = 20%, and system ages typically in the range of 1–6 Gyr. We validated these ages against the very few known clusters and through cross validation of 236 WD-WD binaries. Under the assumption that the components are coeval in a binary system, this provides precise age constraints on the usually low-mass MS companions, mostly inaccessible by any other means.