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arXiv 0909.5049astro-ph.SRastro-ph.IM
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三系大陵五的干涉观测

Interferometric Observations of the Hierarchical Triple System Algol

Sz. Csizmadia, T. Borkovits, Zs. Paragi, P. Abraham, L. Szabados, L. Mosoni, L. Sturmann, J. Sturmann, C. Farrington, H. A. McAlister, T. A. ten Brummelaar, N. … 展开作者

Sz. Csizmadia, T. Borkovits, Zs. Paragi, P. Abraham, L. Szabados, L. Mosoni, L. Sturmann, J. Sturmann, C. Farrington, H. A. McAlister, T. A. ten Brummelaar, N. H. Turner, P. Klagyivik

摘要:

大陵五是一个三颗恒星系统,由一颗紧密的半独立双星和一颗第三颗天体组成。由于近距离双星的空间取向存在争议,这对双星的第三体摄动是一个研究的课题。在这项研究中,我们使用CHARA阵列,位于威尔逊山的六元件光学/IR干涉仪,和最先进的电子EVN干涉技术,确定了近对轨道平面的空间取向。我们发现,密对的节点线的经度是$Ω_1=48\degr\pm2\degr$,密对和宽对的轨道平面的相互倾角是$95\degr\pm3\degr$。后一个值与以前已知的$100\degr$相差$5\degr$,后者意味着系统的倾角变化非常快,没有得到测光观测的证实。我们还研究了系统的动力学与数值积分的运动方程使用我们的结果作为初始条件。我们发现,在近对的倾斜(其振幅$\sim 170\degr$)的大变化,约20千年的周期。这一结果与光度测量观测到的大陵五原初极小期振幅的变化是一致的。

英文摘要:

Algol is a triple stellar system consisting of a close semidetached binary orbited by a third object. Due to the disputed spatial orientation of the close pair, the third body perturbation of this pair is a subject of much research. In this study, we determine the spatial orientation of the close pair orbital plane using the CHARA Array, a six-element optical/IR interferometer located on Mount Wilson, and state-of-the-art e-EVN interferometric techniques. We find that the longitude of the line of nodes for the close pair is $Ω_1=48\degr\pm2\degr$ and the mutual inclination of the orbital planes of the close and the wide pairs is $95\degr\pm3\degr$. This latter value differs by $5\degr$ from the formerly known $100\degr$ which would imply a very fast inclination variation of the system, not borne out by the photometric observations. We also investigated the dynamics of the system with numerical integration of the equations of motions using our result as an initial condition. We found large variations in the inclination of the close pair (its amplitude $\sim 170\degr$) with a period of about 20 millennia. This result is in good agreement with the photometrically observed change of amplitude in Algol's primary minimum.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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