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arXiv 1004.0119astro-ph.GA
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SS 433环双星盘观测结果的解释

Interpretation of observations of the circumbinary disk of SS 433

M. G. Bowler

摘要:

上下文银河系微类星体SS 433拥有一个环双星盘,在明亮的巴耳末H α发射线中最清晰可见。发光物质的轨道速度是双星系统质量的重要决定因素。环双星盘可以通过L2点馈电,反过来又可以馈电一个非常扩展的射电特征,称为ruff。目标。对揭示环双星盘的H α和He I谱线的光谱光学数据进行分析。使用相当不同的信号的比较,以更好地了解磁盘和改进的内环转速的估计。提出一个简单的模型,自然地解释了一些明显奇怪的光谱变化与轨道相位。方法.发表的光谱,几乎每晚超过两个轨道周期的二元系统,进行了分析。H α和He I线被分析为高斯分量的叠加,并构造了一个简单的模型。结果这些数据可以从热点的角度来理解,该热点是由致密物体的接近产生的,以13天的周期围绕内环联星盘旋转。发光的物质随着时间的推移而褪色,对于H α源来说非常慢,但对于He I谱线来说更快。内环的轨道速度约为250公里/秒。结论.双星系统的质量必须超过40个太阳质量,致密的物体必须是一个相当大的恒星黑洞。由此推论,伴星的轨道速度必须超过130 km/s。

英文摘要:

Context. The Galactic microquasar SS 433 is possessed of a circumbinary disk most clearly seen in the brilliant Balmer H alpha emission line. The orbital speed of the glowing material is an important determinant of the mass of the binary system. The circumbinary disk may be fed through the L2 point and in turn may feed a very extended radio feature known as the ruff. Aims. To present an analysis of spectroscopic optical data from H alpha and He I spectral lines which reveal the circumbinary disk. To use comparisons of the rather different signals to better understand the disk and improve estimates of the rotational speed of the inner rim. To present a simple model which naturally explains some apparently bizarre spectral variations with orbital phase. Methods. Published spectra, taken almost nightly over two orbital periods of the binary system, are analysed. H alpha and He I lines are analysed as superpositions of Gaussian components and a simple model constructed. Results. The data are understood in terms of a hot spot, generated by proximity of the compact object, rotating round the inner circumbinary disk with a period of 13 days. The glowing material fades with time, quite slowly for the H alpha source but more rapidly for the He I spectral lines. The orbital speed of the inner rim is approximately 250 km/s. Conclusions. The mass of the binary system must exceed 40 solar masses and the compact object must be a rather massive stellar black hole. The corollary is that the orbital speed of the companion must exceed 130 km/s.

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