论文标题
评估二元参数不确定性对恒星种群特性的影响
Evaluating the impact of binary parameter uncertainty on stellar population properties
论文作者
论文摘要
二进制恒星已被证明对恒星种群的综合光线有重大影响，尤其是在低金属性和早期 - 遥远宇宙中普遍存在的条件。但是，恒星倍数中恒星的比例是质量的函数，它们的初始期和质量比的分布都是从经验上得知仅来自局部宇宙中的观察结果。每个都有相关的不确定性。我们探讨了这些不确定性在二元参数中对综合恒星种群的性质的影响，考虑到哪些属性和时间表最容易受到二元分数引入的不确定性的影响，以及对整合光的观察是否足以确定二进制参数。我们得出的结论是，不确定性在经验二元参数分布中的影响可能小于金属性和恒星人口年龄不确定性对观察数据引入的影响。我们在He II 1640 Angstrom发射线中的发射和紫外线中的连续颜色是高质量二元存在的潜在指标，尽管金属的限制性较差，粉尘灭绝和合理恒星形成历史中的粉尘灭绝和退化性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 timescales 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 Angstrom 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.
