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arXiv 1004.3070astro-ph.SR
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大藻型系统御夫座CL的首次综合光度学研究

The First Comprehensive Photometric Study of the Algol-type System CL Aurigae

Jae Woo Lee, Chun-Hwey Kim, Duck Hyun Kim, Seung-Lee Kim, Chung-Uk Lee, Robert H. Koch

摘要:

我们提出的第一个广泛的光度测量结果CL Aur从我们的BVRI CCD测光22个晚上,从2003年11月到2005年2月。获得了15个新的最小光照时间。在过去的104年中,由于周期性振荡叠加在周期连续增加的基础上,轨道周期发生了变化。振荡的周期和半振幅分别为21.6年和0.0133天。这一细节被解释为由于低光度K型恒星引力束缚在CL Aur封闭系统的光旅行时间效应。我们的光度研究表明CL Aur是一个相对短周期的大陵型双星,q=0.602,i=88 $^\circ$ .2。质量转移从次要的主要日食组件是至少部分负责观察到的长期周期变化率dP/dt = +1.4 $\times10^{-7}$ d yr $^{-1}$。一个冷点模型已经计算,但我们认为,另一种热点模型造成的气体流对热星的影响是更合理的,尽管有两个困难的解释。推导了食系统的绝对尺度,并将食系统的现状与单星和保守密近双星的演化轨迹进行了比较。最后,我们研究了两种不同的计算的热点和重新解释的长期长期的周期变化的光度可能的和解。

英文摘要:

We present the first extensive photometric results of CL Aur from our BVRI CCD photometry made on 22 nights from 2003 November through 2005 February. Fifteen new timings of minimum light were obtained. During the past 104 years, the orbital period has varied due to a periodic oscillation superposed on a continuous period increase. The period and semi-amplitude of the oscillation are about 21.6 yrs and 0.0133 d, respectively. This detail is interpreted as a light-travel-time effect due to a low-luminosity K-type star gravitationally bound to the CL Aur close system. Our photometric study indicates that CL Aur is a relatively short-period Algol-type binary with values of q=0.602 and i=88$^\circ$.2. Mass transfer from the secondary to the primary eclipsing component is at least partly responsible for the observed secular period change with a rate of dP/dt = +1.4$\times10^{-7}$ d yr$^{-1}$. A cool spot model has been calculated but we think that an alternative hot-spot model resulting from a gas stream impact on the hot star is more reasonable despite two difficulties with the explanation. Absolute dimensions of the eclipsing system are deduced and its present state is compared with tracks for single star and conservative close binary evolution. Finally, we examine the possible reconciliation of two different calculations of the luminosity of the hot spot and a re-interpretation of the secular term of the period variability.

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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