Speckle Imaging Measurements of the Relative Tangential Velocities of the Components of T Tauri Binary Stars
Speckle Imaging Measurements of the Relative Tangential Velocities of the Components of T Tauri Binary Stars
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金牛座 T 双星组成部分相对切向速度的散斑成像测量
DOI：
10.1086/117560
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
D. Mccarthy
中科院分区：
文献类型：
--
作者：
A. Ghez;A. Weinberger;G. Neugebauer;K. Matthews;D. Mccarthy
在五年的时间里，我们用散斑成像技术监测了20颗金牛座T双星，距离从0”。09至1”（13-140 AU）。该项目旨在探测组成恒星的相对运动，以确定观测到的伴星(1)是否本质上是恒星，而不是HH天体，以及(2)是否与主星有引力束缚。这些观测表明，对近距离双星分离的散斑成像测量可以以几毫弧秒的精度进行。大多数观测到的系统显示出显著的相对速度，这些相对速度(1)与HH天体的预期运动不一致，(2)大于这些恒星形成区域的速度色散，因此不是微分固有运动的结果，(3)与轨道运动一致。这是第一次证明这些系统是物理绑定的。此外，这些相对速度测量提供了动力学证据，表明这些金牛座T双星系统的平均总质量为~ 1.7 m_⊙。
Over a five year period, we have used speckle imaging to monitor 20 T Tauri binary stars with separations ranging from 0".09 to 1" (13-140 AU). This project is aimed at detecting the relative motion of the component stars to ascertain whether or not the observed companions (1) are stellar in nature, as opposed to being HH objects, and (2) are gravitationally bound to the primary stars. These observations demonstrate that speckle imaging measurements of close binary stars' separations can be made with an accuracy of a few milliarcseconds. The majority of the observed systems show significant relative velocities which (1) are not consistent with the motion expected for HH objects, (2) are greater than the velocity dispersion of these star-forming regions and thus are not the result of differential proper motion, and (3) are consistent with orbital motion. This is the first demonstration that these systems are physically bound. Furthermore, these relative velocity measurements provide dynamical evidence that the average total mass of these T Tauri binary star systems is ~l.7M_⊙.