从NPOI对θ 1猎户座C的光学干涉观测和对系统轨道的影响
Optical interferometric observations of Theta 1 Orionis C from NPOI and implications for the system orbit
摘要:
利用海军原型光学干涉仪(NPOI),在2006年2月至2007年3月的一段时间内,对猎户座θ 1 C双星系统进行了空间分辨。这些数据显示了14个月内的显著轨道运动,在将NPOI数据与文献中以前对该系统的测量相结合后,观测跨越了10年的轨道。我们的研究结果表明,第二没有经历一个异常密切的近星点通过今年,在矛盾的预测,最近发表的,高偏心~11年的轨道。今后将需要对该源进行观测,以改进轨道解。系统距离方面的结果可能产生的影响进行了讨论,虽然这项工作的主要结论是,一个明确的轨道解决方案将需要更多的时间来获得足够的相位覆盖,并预期在近星点的相互作用的影响没有发生在2007年。
英文摘要:
With the Navy Prototype Optical Interferometer (NPOI), the binary system Theta 1 Orionis C, the most massive member of the Trapezium, was spatially resolved over a time period extending from February 2006 to March 2007. The data show significant orbital motion over the 14 months, and, after combining the NPOI data with previous measurements of the system from the literature, the observations span 10 years of the orbit. Our results indicate that the secondary did not experience an unusually close periastron passage this year, in contradiction to the prediction of a recently published, highly eccentric ~11 year orbit. Future observations of this source will be required to improve the orbital solution. Possible implications of the results in terms of system distance are discussed, although a main conclusion of this work is that a definitive orbit solution will require more time to obtain sufficient phase coverage, and that the interaction effects expected at periastron did not occur in 2007.
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