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arXiv 1010.3206astro-ph.SR
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高质量双星化学演化的观测方法

Observational approach to the chemical evolution of high-mass binaries

K. Pavlovski, J. Southworth, E. Tamajo, V. Kolbas

摘要:

密近双星合成光谱的复杂性使得对单个恒星光谱的研究极为困难。由于这个原因,关于密近双星中大质量恒星的化学成分的信息非常少,尽管它对于理解大质量恒星和密近双星系统的演化非常重要。解决这个问题的一种方法是:光谱解纠缠允许将复合光谱的时间序列分解成它们的各个分量,同时保留输入光谱中的总信噪比。在这里,我们提出了我们正在进行的项目的结果,以获得高质量的组件在二进制和多个系统的大气参数,使用光谱解缠。到目前为止,我们已经对8个食双星系统中的14颗恒星进行了详细的丰度研究。其中,V380 Cyg,V621 Per和V453 Cyg是最具信息性的,因为它们的主要组件接近或超过了TAMS。与旋转单星演化模型的理论预测相反,这两颗恒星相对于相同质量的未演化主序星没有显示出丰度变化。很明显,在双星成分的化学演化中,其他效应也很重要。正在对更多系统进行分析,包括AH Cep、CW Cep和V478 Cyg。

英文摘要:

The complexity of composite spectra of close binaries makes the study of the individual stellar spectra extremely difficult. For this reason there exists very little information on the chemical composition of high-mass stars in close binaries, despite its importance for understanding the evolution of massive stars and close binary systems. A way around this problem exists: spectral disentangling allows a time-series of composite spectra to be decomposed into their individual components whilst preserving the total signal-to-noise ratio in the input spectra. Here we present the results of our ongoing project to obtain the atmospheric parameters of high-mass components in binary and multiple systems using spectral disentangling. So far, we have performed detailed abundance studies for 14 stars in eight eclipsing binary systems. Of these, V380 Cyg, V621 Per and V453 Cyg are the most informative as their primary components are evolved either close to or beyond the TAMS. Contrary to theoretical predictions of rotating single-star evolutionary models, both of these stars show no abundance changes relative to unevolved main sequence stars of the same mass. It is obvious that other effects are important in the chemical evolution of components in binary stars. Analyses are ongoing for further systems, including AH Cep, CW Cep and V478 Cyg.

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