LUT observations of the mass-transferring binary AI Dra

LUT observations of the mass-transferring binary AI Dra
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质量转移二元 AI Dra 的 LUT 观测结果

DOI:
10.1007/s10509-016-2771-7
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发表时间:
2016-05
影响因子:
1.9
通讯作者:
Liu, Nianping
Liu, Nianping
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Li, Linjia;Zhou, Xiao;Zhao, Ergang;Liu, Nianping

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2014年10月,月基紫外望远镜(LUT)观测到了食双星AI Dra的完整紫外波段光变曲线。采用这种连续不间断的光变曲线对于确定双星系统的物理和轨道参数非常有用。光斑模型的光度解通过使用 W-D(Wilson 和 Devinney)方法获得。已证实 AI Dra 是一个半分离双星,其次要成分填充了其临界罗氏瓣,这表明应该发生从次要成分到主要成分的质量转移。基于所有可用的日食时间的轨道周期分析表明,长期周期增加和两个循环变化。长期周期的增加是通过从次要成分到主要成分的质量传递来解释的,其速率为 4.12×10−8M⊙/yr$4.12 \times10^{-8}M_{\odot}/\mbox{yr}$,这与光度学解一致。两次循环振荡是由于光走时效应 (LTTE) 造成的,这是由于两个冷伴星以接近 2:1 的平均运动共振的方式存在。光度测量解决方案和轨道周期分析都证实 AI Dra 是一个传质双星,巨大的主星填充了其临界罗希瓣的 69%。在初级演化到填充临界罗希瓣后,传质将发生逆转,双星将演化为接触构型。
Complete UV band light curve of the eclipsing binary AI Dra was observed with the Lunar-based Ultraviolet Telescope (LUT) in October 2014. It is very useful to adopt this continuous and uninterrupted light curve to determine physical and orbital parameters of the binary system. Photometric solutions of the spot model are obtained by using the W–D (Wilson and Devinney) method. It is confirmed that AI Dra is a semi-detached binary with secondary component filling its critical Roche lobe, which indicates that a mass transfer from the secondary component to the primary one should happen. Orbital period analysis based on all available eclipse times suggests a secular period increase and two cyclic variations. The secular period increase was interpreted by mass transfer from the secondary component to the primary one at a rate of 4.12×10−8M⊙/yr$4.12 \times10^{-8}M_{\odot}/\mbox{yr}$, which is in agreement with the photometric solutions. Two cyclic oscillations were due to light travel-time effect (LTTE) via the presence of two cool stellar companions in a near 2:1 mean-motion resonance. Both photometric solutions and orbital period analysis confirm that AI Dra is a mass-transferring binary, the massive primary is filling 69 % of its critical Roche lobe. After the primary evolves to fill the critical Roche lobe, the mass transfer will be reversed and the binary will evolve into a contact configuration.
DOI: 10.1007/s10509-009-0197-1
发表时间: 2010-03
影响因子: 1.9
作者:
P. Zasche;R. Uhlář;P. Svoboda
通讯作者: P. Zasche;R. Uhlář;P. Svoboda
对邻近双星循环周期变化最合理的解释:RS CVn 型双星 WW Dra 的情况
DOI: 10.1111/j.1365-2966.2010.16584.x
发表时间: 2010-04
影响因子: 4.8
作者:
Liao, W. -P.;Qian, S. -B.
通讯作者: Qian, S. -B.
DOI: 10.1088/0004-6256/144/3/73
发表时间: 2012-07
期刊: The Astronomical Journal
影响因子: --
作者:
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DOI: 10.5860/choice.27-6327
发表时间: 2021-06
期刊: Fundamentals of Astrophysics
影响因子: --
作者:
O. R. Pols
通讯作者: O. R. Pols
DOI: 10.1086/523634
发表时间: 2008
期刊: The Astrophysical Journal
影响因子: --
作者:
R. Wilson
通讯作者: R. Wilson