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arXiv 1104.4810astro-ph.SR
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多星系统HD 193322的干涉光谱分析

An Interferometric and Spectroscopic Analysis of the Multiple Star System HD 193322

Theo A. ten Brummelaar, David P. O'Brien, Brian D. Mason, Christopher D. Farrington, Alexander W. Fullerton, Douglas R. Gies, Erika D. Grundstrom, William I. Ha… 展开作者

Theo A. ten Brummelaar, David P. O'Brien, Brian D. Mason, Christopher D. Farrington, Alexander W. Fullerton, Douglas R. Gies, Erika D. Grundstrom, William I. Hartkopf, Rachel A. Matson, Harold A. McAlister, M. Virginia McSwain, Lewis C. Roberts,, Gail H. Schaefer, Sergio Simon-Diaz, Judit Sturmann, Laszlo Sturmann, Nils H. Turner, Stephen J. Williams

摘要:

HD 193322是一个由大质量恒星组成的多恒星系统,位于星团Collinder 419的中心。在这里,我们报告的新的光谱观测和径向速度的窄线组件Ab1,我们用来确定它的轨道运动围绕一个密切的同伴Ab2($P = 312$ d)和围绕一个遥远的第三颗恒星Aa($P = 35$ y)。我们还获得了长基线干涉测量的目标在$K^\prime$波段与CHARA阵列,我们使用在两种方式。首先,我们结合发表的散斑干涉测量CHARA分离条纹包测量,以改善宽Aa,Ab二进制的视觉轨道。其次,我们利用Aa星的条纹包来标定Ab1,Ab2双星的条纹可见度,并通过分析这些条纹可见度来确定该双星的可见轨道。两颗质量最大的恒星Aa和Ab1的质量分别约为21和$23 M_\odot$,它们的谱线变宽表明它们分别代表了快和慢的投影旋转速度的极端。

英文摘要:

The star HD 193322 is a remarkable multiple system of massive stars that lies at the heart of the cluster Collinder 419. Here we report on new spectroscopic observations and radial velocities of the narrow-lined component Ab1 that we use to determine its orbital motion around a close companion Ab2 ($P = 312$ d) and around a distant third star Aa ($P = 35$ y).We have also obtained long baseline interferometry of the target in the $K^\prime$-band with the CHARA Array that we use in two ways. First, we combine published speckle interferometric measurements with CHARA separated fringe packet measurements to improve the visual orbit for the wide Aa,Ab binary. Second, we use measurements of the fringe packet from Aa to calibrate the visibility of the fringes of the Ab1,Ab2 binary, and we analyze these fringe visibilities to determine the visual orbit of the close system. The two most massive stars, Aa and Ab1, have masses of approximately 21 and $23 M_\odot$, respectively, and their spectral line broadening indicates that they represent extremes of fast and slow projected rotational velocity, respectively.

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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