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arXiv 1802.02747astro-ph.SR
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蛇夫座和上半人马座年轻双星的轨道运动

Orbital Motion of Young Binaries in Ophiuchus and Upper Centaurus-Lupus

G. H. Schaefer, L. Prato, M. Simon

摘要:

我们目前的轨道位置和流量比的测量的17个二进制和三进制系统的蛇夫座恒星形成区和上半人马座-狼星团的基础上自适应光学成像在凯克天文台。我们首次报告在MML 50和MML 53中检测到视觉同伴,以及可能在WSB 21中检测到第三个组件。对于我们样本中的六个系统,我们的测量提供了十多年前首次发现后的第二个轨道位置。对于八个系统有足够的轨道覆盖,我们分析了轨道的解决方案,适合的数据范围。最终,这些观测将有助于为测量这些前主序星的精确质量和了解年轻多系统中轨道参数的分布提供基础。

英文摘要:

We present measurements of the orbital positions and flux ratios of 17 binary and triple systems in the Ophiuchus star forming region and the Upper Centaurus-Lupus cluster based on adaptive optics imaging at the Keck Observatory. We report the detection of visual companions in MML 50 and MML 53 for the first time, as well as the possible detection of a third component in WSB 21. For six systems in our sample, our measurements provide a second orbital position following their initial discoveries over a decade ago. For eight systems with sufficient orbital coverage, we analyze the range of orbital solutions that fit the data. Ultimately, these observations will help provide the groundwork toward measuring precise masses for these pre-main sequence stars and understanding the distribution of orbital parameters in young multiple systems.

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