Orbital and stochastic far-ultraviolet variability in the nova-like system V3885 Sgr FUV variability in V3885 Sgr
Orbital and stochastic far-ultraviolet variability in the nova-like system V3885 Sgr FUV variability in V3885 Sgr
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类新星系统 V3885 Sgr 中的轨道和随机远紫外线变异性 V3885 Sgr 中的 FUV 变异性
DOI：
10.1111/j.1365-2966.2011.19992.x
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发表时间：
2012
影响因子：
4.8
通讯作者：
Prinja R
中科院分区：
文献类型：
--
作者：
Prinja R
本文分析了高时间分辨的FUSE卫星时间标签光谱数据，建立了类新星激变变星双星V3885 Sgr的远紫外吸收线特征。我们确定了低（Lyβ，Ciii，Niiii）和高（Siv，Pv，Ovi）离子种类的时间行为，并突出了这些谱线中相应的轨道相位调制变化。平均而言，吸收槽蓝移，由于低速盘风外流。吸收线中的非常快速（约15分钟）的波动是孤立的，这是随机密度变化的指示。计算了FUV谱线的多普勒层析图，为气流与吸积盘相互作用的结构提供了证据。我们的结论是，线的深度和速度的变化作为轨道相位的函数是一致的不对称性，其起源于一个线发射，本地化的盘流相互作用区域。
Highly time-resolved time-taggedFUSEsatellite spectroscopic data are analysed to establish the far-ultraviolet (FUV) absorption line characteristics of the nova-like cataclysmic variable binary, V3885 Sgr. We determine the temporal behaviour of low (Lyβ, Ciii, Niii) and high (Siv, Pv, Ovi) ion species, and highlightcorrespondingorbital phase modulated changes in these lines. On average, the absorption troughs are blueshifted due to a low-velocity disc wind outflow. Very rapid (∼5 min) fluctuations in the absorption lines are isolated, which are indicative of stochastic density changes. Doppler tomograms of the FUV lines are calculated which provide evidence for structures where a gas stream interacts with the accretion disc. We conclude that the line depth and velocity changes as a function of orbital phase are consistent with an asymmetry that has its origin in a line-emitting, localized disc–stream interaction region.