GRAVITY Spectro-interferometric Study of the Massive Multiple Stellar System HD 93206 A

GRAVITY Spectro-interferometric Study of the Massive Multiple Stellar System HD 93206 A
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大质量多恒星系统 HD 93206 A 的重力光谱干涉研究

DOI:
10.3847/1538-4357/aa803d
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发表时间:
2017
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
R. Boekel
R. Boekel
中科院分区:
--
文献类型:
--
作者:
J. Sanchez;A. Alberdi;R. Barbá;J. Bestenlehner;J. Bestenlehner;F. Cantalloube;W. Brandner;T. Henning;C. Hummel;J. M. Apellániz;J. Pott;R. Schödel;R. Boekel

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描述大质量恒星系统的动力学和相互作用成分的天体物理性质是了解它们的形成和演化的先决条件。毫秒分辨率的光学干涉测量是分辨大质量多紧凑系统的一项关键观测技术。在这里,我们报告了对船底星云复合体中大质量星系团Collinder 93206 A的超大型望远镜干涉仪/重力、麦哲伦/折叠端口红外梯形图和MPG2.2m/Feros系统的观测结果。它的总质量约为四重,是已知的最紧凑的大质量四重星系之一。除了测量外双星AA-Ac的分离和位置角外,我们还观察到了BRγ和He I随着两颗内双星的轨道运动而发生的位相变化。从微分位相()分析,我们得出结论,BR-γ辐射来自单个双星组件内部的相互作用区,这与以前基于风-风相互作用的系统X射线发射模型是一致的。在平均偏差为3σ的情况下,我们确定了BR∼线发射区大小的上限为pγ0.157 mA(0.35Au)。未来使用8米单位望远镜进行的重力干涉观测将使我们能够将谱线发射区的角度限制到20μas(在船底座星云距离处为0.05Au)。
Characterization of the dynamics of massive star systems and the astrophysical properties of the interacting components are a prerequisite for understanding their formation and evolution. Optical interferometry at milliarcsecond resolution is a key observing technique for resolving high-mass multiple compact systems. Here, we report on Very Large Telescope Interferometer/GRAVITY, Magellan/Folded-port InfraRed Echellette, and MPG2.2 m/FEROS observations of the late-O/early-B type system HD 93206 A, which is a member of the massive cluster Collinder 228 in the Carina nebula complex. With a total mass of about , it is one of the most compact massive quadruple systems known. In addition to measuring the separation and position angle of the outer binary Aa–Ac, we observe Brγ and He i variability in phase with the orbital motion of the two inner binaries. From the differential phase ( ) analysis, we conclude that the Brγ emission arises from the interaction regions within the components of the individual binaries, which is consistent with previous models for the X-ray emission of the system based on wind–wind interaction. With an average 3σ deviation of , we establish an upper limit of p ∼ 0.157 mas (0.35 au) for the size of the Brγ line-emitting region. Future interferometric observations with GRAVITY using the 8 m Unit Telescopes will allow us to constrain the line-emitting regions down to angular sizes of 20 μas (0.05 au at the distance of the Carina nebula).
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