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arXiv 1711.03341astro-ph.SR
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热亚矮星的FEROS巡天

A FEROS Survey of Hot Subdwarf Stars

S. Vennes, P. Nemeth, A. Kawka

摘要:

我们已经完成了22个紫外选择热亚矮星的调查使用光纤馈增程光学光谱仪(FEROS)和2.2米望远镜在拉西拉。样本包括明显的单个物体以及与明亮的未解决的同伴配对的热亚矮星。样本是从我们的GALEX热亚矮星目录中提取的。我们确定了三个新的短周期系统(P=3.5小时至5天),并确定了一个长周期(P=62.66天)sdO加G III系统的轨道参数。这个特殊的系统应该演变成一个封闭的双退化系统后,第二个共同的包络相。我们还对亚矮星进行了化学丰度研究:一些物体显示氮和氩的丰度相对于氧过剩。我们介绍了该方案的主要成果。

英文摘要:

We have completed a survey of twenty-two ultraviolet-selected hot subdwarfs using the Fiber-fed Extended Range Optical Spectrograph (FEROS) and the 2.2-m telescope at La Silla. The sample includes apparently single objects as well as hot subdwarfs paired with a bright, unresolved companion. The sample was extracted from our GALEX catalogue of hot subdwarf stars. We identified three new short-period systems (P=3.5 hours to 5 days) and determined the orbital parameters of a long-period (P=62.66 d) sdO plus G III system. This particular system should evolve into a close double degenerate system following a second common envelope phase. We also conducted a chemical abundance study of the subdwarfs: Some objects show nitrogen and argon abundance excess with respect to oxygen. We present key results of this programme.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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