A BINARY ORBIT FOR THE MASSIVE, EVOLVED STAR HDE 326823, A WR+O SYSTEM PROGENITOR
A BINARY ORBIT FOR THE MASSIVE, EVOLVED STAR HDE 326823, A WR+O SYSTEM PROGENITOR
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大型演化恒星 HDE 326823 的双星轨道，WR O 系统的前身
DOI：
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发表时间：
2011
期刊：
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通讯作者：
Stephen J. Williams
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作者：
Noel D Richardson;D. Gies;Stephen J. Williams
热的星星HDE 326823是一个候选的过渡相天体，正在演变成一个富氮的沃尔夫-拉叶星星。它也是一个已知的低振幅光度变星，周期为6.123天。我们提出了新的，高分辨率和中等分辨率的光谱HDE 326823，我们表明，吸收线显示相干多普勒频移与此期间，而发射线显示很少或没有速度变化。我们解释吸收线的变化作为轨道运动的明显明亮的星星在一个密切的，相互作用的双星。我们认为，这星星是失去质量的质量增益星星隐藏在厚厚的吸积环面和环双星盘，这是发射线的来源。HDE 326823可能属于一类产生短周期WR+O双星的天体。
The hot star HDE 326823 is a candidate transition-phase object that is evolving into a nitrogen-enriched Wolf–Rayet star. It is also a known low-amplitude, photometric variable with a 6.123 day period. We present new, high- and moderate-resolution spectroscopy of HDE 326823, and we show that the absorption lines show coherent Doppler shifts with this period while the emission lines display little or no velocity variation. We interpret the absorption line shifts as the orbital motion of the apparently brighter star in a close, interacting binary. We argue that this star is losing mass to a mass gainer star hidden in a thick accretion torus and to a circumbinary disk that is the source of the emission lines. HDE 326823 probably belongs to a class of objects that produce short-period WR+O binaries.