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arXiv 0912.1876astro-ph.HEastro-ph.GA
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小麦哲伦云中20 Be/X射线双星的光谱学研究

Optical spectroscopy of 20 Be/X-ray Binaries in the Small Magellanic Cloud

Vallia Antoniou, Despina Hatzidimitriou, Andreas Zezas, Pablo Reig

摘要:

本文介绍了用英澳望远镜2dF摄谱仪获得的大样本(共20个)小麦哲伦云(SMC)高质量X射线双星的光谱。所有这些源被发现是Be/X射线双星(Be-XRB),而5个源,我们提出了原来的分类。几个统计测试,这个扩大的样本支持以前的调查结果相似的光谱类型分布的Be-XRB和Be场星的SMC,和Be-XRB的大麦云云和银河系,虽然这可能是小样本的结果。另一方面,我们发现,Be-XRB遵循不同的分布比在银河系中的恒星,也与以前的研究一致。此外,我们发现相似的光谱类型分布之间的麦哲伦云样品。这些结果加强了轨道周期和Halpha线的等效宽度之间的关系,持有铍XRB。SMC Be星有更大的Halpha等效宽度时相比,Be-XRB,支持的概念,拱星盘截断紧凑的对象。

英文摘要:

We present a large sample (20 in total) of optical spectra of Small Magellanic Cloud (SMC) High-Mass X-ray Binaries obtained with the 2dF spectrograph at the Anglo-Australian Telescope. All of these sources are found to be Be/X-ray binaries (Be-XRBs), while for 5 sources we present original classifications. Several statistical tests on this expanded sample support previous findings for similar spectral-type distributions of Be-XRBs and Be field stars in the SMC, and of Be-XRBs in the Large Magellanic Cloud and the Milky Way, although this could be the result of small samples. On the other hand, we find that Be-XRBs follow a different distribution than Be stars in the Galaxy, also in agreement with previous studies. In addition, we find similar Be spectral type distributions between the Magellanic Clouds samples. These results reinforce the relation between the orbital period and the equivalent width of the Halpha line that holds for Be-XRBs. SMC Be stars have larger Halpha equivalent widths when compared to Be-XRBs, supporting the notion of circumstellar disk truncation by the compact object.

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