Evaluating the impact of binary parameter uncertainty on stellar population properties
Evaluating the impact of binary parameter uncertainty on stellar population properties
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DOI：
10.1093/mnras/staa1166
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发表时间：
2020-04
影响因子：
4.8
通讯作者：
E. Stanway;A. Chrimes;J. Eldridge;H. Stevance
中科院分区：
文献类型：
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作者：
E. Stanway;A. Chrimes;J. Eldridge;H. Stevance
双星已经被证明对恒星群体的综合光有重大影响，特别是在低金属量和早期年龄-在遥远的宇宙中普遍存在的条件下。但是，恒星在恒星倍数中的比例作为质量的函数，它们可能的初始周期和质量比的分布都是经验性的，只有在本地宇宙中才能通过观测得知。每个都有相关的不确定性。我们探讨了这些不确定性的二进制参数的综合恒星种群的属性的影响，考虑哪些属性和时间尺度是最容易受到不确定性引入的二进制分数和综合光的观测是否可能足以确定二进制参数。我们的结论是，在经验的二元参数分布的不确定性的影响可能小于所介绍的金属丰度和恒星人口年龄的观测数据的不确定性。我们确定在他二1640年的发射线和连续的紫外光的颜色作为潜在的指标，高质量的二元存在，虽然约束不良的金属丰度，尘埃消光，并在似是而非的星星形成历史的退化可能会淹没任何可测量的信号。
Binary stars have been shown to have a substantial impact on the integrated light of stellar populations, particularly at low metallicity and early ages – conditions prevalent in the distant Universe. But the fraction of stars in stellar multiples as a function of mass, their likely initial periods and distribution of mass ratios are all known empirically from observations only in the local Universe. Each has associated uncertainties. We explore the impact of these uncertainties in binary parameters on the properties of integrated stellar populations, considering which properties and time-scales are most susceptible to uncertainty introduced by binary fractions and whether observations of the integrated light might be sufficient to determine binary parameters. We conclude that the effects of uncertainty in the empirical binary parameter distributions are likely smaller than those introduced by metallicity and stellar population age uncertainties for observational data. We identify emission in the He ii 1640 Å emission line and continuum colour in the ultraviolet–optical as potential indicators of a high-mass binary presence, although poorly constrained metallicity, dust extinction, and degeneracies in plausible star formation history are likely to swamp any measurable signal.