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arXiv 1002.1643astro-ph.SR
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2002年底共生双星Z And增亮过程中的氢氦谱线

The hydrogen and helium lines of the symbiotic binary Z And during its brightening at the end of 2002

N. A. Tomov, M. T. Tomova, D. V. Bisikalo

摘要:

高分辨率的观测在该地区的线Halpha,He II 4686和Hgamma的光谱的共生二进制Z和期间进行的小幅度增亮在2002年底。氢谱线呈双峰型。这些配置文件提供了一个理由,假设线可以发射主要是由光学薄吸积盘。由于Halpha线受到包络线辐射的强烈污染,因此考虑到吸积盘的性质,我们使用Hgamma线。Halalpha线有宽阔的翅膀,这应该主要是由辐射阻尼决定的,但来自系统中紧凑物体的高速恒星风也可能有助于它们的出现。Hgamma线有一个广泛的发射分量,这被认为是主要从吸积盘的内部发射。He II 4686线也有很宽的发射分量,但它应该出现在高速星风区域。吸积盘的外半径可以从峰之间的位移计算出来。假设轨道倾角在47 $^\circ$ ~ 76 $^\circ$之间,则外半径为20 ~ 50 R_sun。所观察到的线的行为可以被认为是在框架内的模型提出的解释在2000年至2002年的主要增亮的这一二进制的线光谱。

英文摘要:

High resolution observations in the region of the lines Halpha, He II 4686 and Hgamma of the spectrum of the symbiotic binary Z And were performed during its small-amplitude brightening at the end of 2002. The profiles of the hydrogen lines were double-peaked. These profiles give a reason to suppose that the lines can be emitted mainly by an optically thin accretion disc. The Halpha line is strongly contaminated by the emission of the envelope, therefore for consideration of accretion disc properties we use the Hgamma line. The Halpha line had broad wings which are supposed to be determined mostly from radiation damping but high velocity stellar wind from the compact object in the system can also contribute to their appearance. The Hgamma line had a broad emission component which is assumed to be emitted mainly from the inner part of the accretion disc. The line He II 4686 had a broad emission component too, but it is supposed to appear in a region of a high velocity stellar wind. The outer radius of the accretion disc can be calculated from the shift between the peaks. Assuming, that the orbit inclination can ranges from 47$^\circ$ to 76$^\circ$, we estimate the outer radius as 20 - 50 R_sun. The behaviour of the observed lines can be considered in the framework of the model proposed for interpretation of the line spectrum during the major 2000 - 2002 brightening of this binary.

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