V691 CrA（X1822-371）的体层摄影研究
A tomographic study of V691 CrA (X1822-371)
摘要：
我们提出了低质量X射线双星V691 CrA的多普勒和调制层析成像，并使用2010年和2011年在Las Campanas天文台使用6.5米麦哲伦巴德望远镜获得的数据。在Hα和He II（λ4686）中，这两年都观测到了盘状和热点。在He II（λ5411）中，使用2010年的数据可以看到盘的清晰图像。我们首次对He I（λ5876）吸收线进行了层析成像，并探测到施主星L_1点附近的吸收。我们还提出了第一次调制层析成像的发射线Hα和检测发射的次级。Hα双峰嵌入深吸收槽中，证实了体系中存在巴耳末线吸收物质。我们对Hα的观测表明，其吸收相位范围比Hβ更大，这可能是由于从热点喷射的物质在向下游行进时被加热所致。我们还提出了在某些阶段，吸氢喷流可能被盘的隆起所掩盖。
英文摘要：
We present Doppler and modulation tomography of the low-mass X-ray binary V691 CrA with data obtained using the 6.5-m Magellan Baade telescope at the Las Campanas Observatory in 2010 and 2011. The disc and hotspot are observed in Hαand He II (λ4686) in both years. A clear image of the disc is seen in He II (λ5411) using the 2010 data. We present the first tomography of the absorption line He I (λ5876) and detect absorption near the L_1 point of the donor star. We also present the first modulation tomography of the emission line Hαand detect emission from the secondary. The Hαdouble peaks are imbedded in a deep absorption trough confirming the presence of Balmer line absorbing material in the system. Our observations of Hαshow absorption in a larger phase range than in Hβwhich could be due to heating up of sprayed matter from the hotspot as it travels downstream. We also suggest possible occultation of the Hαabsorbing spray by the disc bulge at certain phases.
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