arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1506.05972astro-ph.SR
收藏

狮子座接触双星XZ的光度学研究和周期分析

Photometric study and period analysis of the contact binary XZ Leonis

Changqing Luo, Xiaobin. Zhang, Licai Deng, Kun Wang, Yangping Luo

摘要:

本文介绍了被忽略的接触双星狮子座XZ的多色CCD测光。获得了完全覆盖的VRI波段光变曲线和4倍的最小光变曲线。结合光度和以前发表的径向速度数据,进行了修订的光度分析的二元系统,通过应用威尔逊Devinney代码。在大质量的主成分上靠近公共包层颈部区域放置一个热点,光变曲线得到了令人满意的模拟。结合光度解和视向速度解,揭示了狮子座XZ是一颗A型接触双星,接触度为24($\pm1)\%$ .测得各组分的绝对参数为M_1 = 1.74($\pm$ 0.06)M_ \odot,M_2 = 0.61($\pm$ 0.02)M_ \odot,R_1 = 1.69($\pm$ 0.01)R_ \odot,R_2 = 1.07($\pm0.01$)R_ \odot,L_1 = 6.73($\pm0.08$)L_ \odot,L_2 = 2.40($\pm$ 0.04)L_ \odot .在现有数据的基础上,研究了该系统的长期轨道周期行为。结果表明,该双星系统在过去30年中经历了轨道周期的持续增长,其增长率为dP/dt = + 6.12 \times {10^{-8}}天/年^{-1},这表明从第二组分到第一组分可能存在质量转移,其速率为dM/dt= 3.92 \times 10^{-8} M_ \odot/年^{-1}.预计该双星系统将在$1.56 \times 10^6$年内演化到断接触阶段。这可能是支持热弛豫振荡理论的证据。

英文摘要:

We present multi-color CCD photometry of the neglected contact binary XZ Leo. Completely covered VRI band light curves and four times of minimum light were obtained. Combining the photometric and previously published radial velocity data, a revised photometric analysis was carried out for the binary system by applying the Wilson-Devinney code. With a hot spot placed on the massive primary component near the neck region of the common envelope, the light curves were satisfactorily modeled. The photometric solution combined with the radial velocity solution reveals that XZ Leo is an A-type contact binary with a degree of contact of 24($\pm1)\%$. The absolute parameters of the components were determined as M_1 = 1.74($\pm$0.06)M_\odot, M_2 = 0.61($\pm$0.02)M_\odot, R_1 = 1.69($\pm$0.01)R_\odot, R_2 = 1.07($\pm0.01$)R_\odot, L_1 = 6.73($\pm0.08$) L_\odot, L_2 = 2.40($\pm$0.04)L_\odot. Based on all the available data, the long-term orbital period behavior of the system was investigated. It indicates that the binary system was undergoing continuous orbital period increase in the past three decades with a rate of dP/dt = + 6.12 \times {10^{-8}} days yr^{-1}, which suggests a probable mass transfer from the secondary to the primary component at a rate of dM/dt= 3.92\times 10^{-8} M_\odot yr^{-1}. The binary system is expected to evolve into the broken-contact stage in $1.56 \times 10^6$ years. This could be evidence supporting the Thermal Relaxation Oscillation theory.

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。

↑