arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1504.03752astro-ph.SR
收藏

天鹅座DK系统的物理性质和轨道行为

The Physical Nature and Orbital Behavior of the Eclipsing System DK Cygni

Jae Woo Lee, Jae-Hyuck Youn, Jang-Ho Park, Marek Wolf

摘要:

本文对热过接触双星DK Cyg提出了新的CCD测光方法,并对光变和周期变化作出了合理的解释。从1962年到2012年的历史光和速度曲线同时分析了威尔逊-Devinney(W-D)合成代码。通过在主星上应用磁冷斑,对亮度扰动进行了令人满意的模拟。基于261次最小光,包括116个新的计时和跨越超过87年,周期研究表明,由于叠加在向上抛物线上的周期性振荡,轨道周期发生了变化。调制的周期和半振幅分别为78.1年和0.0037天。这一细节被解释为一个最小质量为$M_3$ =0.065 $M_\odot$的环联星伴星的光旅行时间效应,在棕矮星的理论极限$\sim$ 0.07 M $_\odot$之内。在$+$ 2.74 $\times $ 10 $^{-10}$的分数率下观察到的周期增加与我们的W-D合成计算的结果非常一致。从次级组分到初级组分的质量转移是长期周期变化的主要原因。我们从绝对维度考察了DK Cyg系统的演化状态。

英文摘要:

New CCD photometry is presented for the hot overcontact binary DK Cyg, together with reasonable explanations for the light and period variations. Historical light and velocity curves from 1962 to 2012 were simultaneously analyzed with the Wilson-Devinney (W-D) synthesis code. The brightness disturbances were satisfactorily modeled by applying a magnetic cool spot on the primary star. Based on 261 times of minimum light including 116 new timings and spanning more than 87 yrs, a period study reveals that the orbital period has varied due to a periodic oscillation superposed on an upward parabola. The period and semi-amplitude of the modulation are about 78.1 yrs and 0.0037 d, respectively. This detail is interpreted as a light-travel-time effect due to a circumbinary companion with a minimum mass of $M_3$=0.065 $M_\odot$, within the theoretical limit of $\sim$0.07 M$_\odot$ for a brown dwarf star. The observed period increase at a fractional rate of $+$2.74 $\times $10$^{-10}$ is in excellent agreement with that calculated from our W-D synthesis. Mass transfer from the secondary to the primary component is mainly responsible for the secular period change. We examined the evolutionary status of the DK Cyg system from the absolute dimensions.

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。

↑