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arXiv 1606.06324astro-ph.SR
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一个包含两颗双星的五恒星系统

A Quintuple Star System Containing Two Eclipsing Binaries

S. Rappaport, H. Lehmann, B. Kalomeni, T. Borkovits, D. Latham, A. Bieryla, H. Ngo, D. Mawet, S. Howell, E. Horch, T. L. Jacobs, D. LaCourse, A. Sodor, A. Vanderburg, K. Pavlovski

摘要:

我们提出了一个五恒星系统,其中包含两个食双星。这个不寻常的建筑包括两个在天空中相隔11英寸的恒星图像:EPIC 212651213和EPIC 212651234。更偏东的图像(212651213)实际上包含了两个食双星,它们在图像中的分辨率为0.09”,而西风图像(212651234)在自适应光学(AO)、斑点成像和径向速度(RV)研究中似乎是单一的。“A”双星是圆形的,周期为5.1天,而“B”双星是偏心的,周期为13.1天。A和B双星的伽马速度相差约10 km/s。这一点,再加上它们的0.09”的分辨投影分离,表明在圆形轨道的简化假设下,“C”双星(由A绕B轨道运行组成)的轨道周期和分离分别为~65年和~25 AU。在未来几年内,通过RV、AO和斑点成像研究,C轨道内的运动应该是可辨别的。C系统(即,212651213)的径向速度和自行与212651234的径向速度和自行仅相差~1.4 km/s和~3 mas/yr。这组相似的三维空间速度强烈暗示这两个物体也是物理上束缚的,使其至少是一个五倍的恒星系统。

英文摘要:

We present a quintuple star system that contains two eclipsing binaries. The unusual architecture includes two stellar images separated by 11" on the sky: EPIC 212651213 and EPIC 212651234. The more easterly image (212651213) actually hosts both eclipsing binaries which are resolved within that image at 0.09", while the westerly image (212651234) appears to be single in adaptive optics (AO), speckle imaging, and radial velocity (RV) studies. The 'A' binary is circular with a 5.1-day period, while the 'B' binary is eccentric with a 13.1-day period. The gamma velocities of the A and B binaries are different by ~10 km/s. That, coupled with their resolved projected separation of 0.09", indicates that the orbital period and separation of the 'C' binary (consisting of A orbiting B) are ~65 years and ~25 AU, respectively, under the simplifying assumption of a circular orbit. Motion within the C orbit should be discernible via future RV, AO, and speckle imaging studies within a couple of years. The C system (i.e., 212651213) has a radial velocity and proper motion that differ from that of 212651234 by only ~1.4 km/s and ~3 mas/yr. This set of similar space velocities in 3 dimensions strongly implies that these two objects are also physically bound, making this at least a quintuple star system.

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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