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arXiv 0810.3245astro-ph
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V592 Cas - An外流的光波长观测

Observations of V592 Cas - An Outflow at Optical Wavelengths

S. Kafka, D. W. Hoard, R. K. Honeycutt, C. P. Deliyannis

摘要:

我们提出了新的红色光谱的V592 Cas的目的是探索该系统的流出的光谱区域的基础白矮星和吸积盘的属性不显着的H-α和HeI线轮廓的吸收分量的贡献。我们使用H-α发射线来研究风,它表现为明显的蓝移P-Cygni吸收槽,其低速端污染了发射线轮廓的蓝色一侧。风的性质似乎是间歇性的,多个事件在H-α中达到5000公里/秒的速度。类似的(但较弱)风的签名出现在HeI 5876 AA线,但没有在HeI 6678 AA。我们的数据表明,在风发作的风是相位相关的,是可见的系统的一半轨道。考虑到V592 Cas几乎是正面观察的,流出的对称轴线不能与盘正交和/或流出必须在流出几何形状中具有一些其他固有的不对称性。风的一个可能的起源是在一个盘热点,要么在吸积流的初始撞击点在盘边缘,或作为盘溢出的结果(类似于西南部的六分仪星)。在一个晚上的光谱观测期间的同时光学光度学表明,在该系统中的光学亮度变化和流出的强度之间没有明确的关系。

英文摘要:

We present new red optical spectra of V592 Cas aimed at exploring the properties of the outflow of this system in a spectral region where the underlying white dwarf and the accretion disk do not contribute significantly to the observed absorption components of the H-alpha and HeI line profiles. We use the H-alpha emission line to study the wind, which appears as pronounced blueshifted P-Cygni absorption troughs whose low velocity end contaminates the blue side of the emission line profile. The wind appears to be episodic in nature, with multiple events reaching velocities of 5000km/sec in H-alpha. Similar (but weaker) wind signatures appear in the HeI5876AA line but are absent in HeI6678AA. Our data suggest that during wind episodes the wind is phase dependent and is visible for half the orbit of the system. Considering that V592 Cas is viewed almost face-on, the symmetry axis of the outflow can not be orthogonal to the disk and/or the outflow must have some other inherent asymmetry in outflow geometry. A possible origin of the wind is in a disk hotspot, either at the initial impact point of the accretion stream on the disk edge or as a result of disk overflow (similar to SW Sextantis stars). Simultaneous optical photometry during one night of our spectroscopic observations indicate that there is no clear relationship between the optical brightness variations and the strength of the outflow in this system.

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