最近的褐矮星双星：Epsanitary Indi Ba，Bb的动力学质量
Dynamical masses for the nearest brown dwarf binary: Epsilon Indi Ba, Bb
摘要：
我们目前的初步天体测量结果，已知最近的棕矮星双星太阳：Epsanitary Indi Ba，Bb在3.626 pc的距离。自2004年6月以来，通过VLT NACO近红外自适应光学系统对两颗褐矮星（光谱类型T1和T6）的相对分离进行持续监测，我们获得了121 MJup的系统动力学总质量，比McCaughrean等人（2004）获得的质量大60%，这意味着该系统可能有5 Gyr的年龄。自2005年8月以来，我们还一直在使用VLT FORS 2光学成像仪监测系统的绝对天体测量运动，以确定单个质量。我们预测在2010年初会有一个近星点通过，到那时系统的质量将被限制在< 1兆焦耳，我们将能够以动态的、独立于模型的方式精确地确定单个质量。
英文摘要：
We present preliminary astrometric results for the closest known brown dwarf binary to the Sun: Epsilon Indi Ba, Bb at a distance of 3.626 pc. Via ongoing monitoring of the relative separation of the two brown dwarfs (spectral types T1 and T6) with the VLT NACO near-IR adaptive optics system since June 2004, we obtain a model-independent dynamical total mass for the system of 121 MJup, some 60% larger than the one obtained by McCaughrean et al. (2004), implying that the system may be as old as 5 Gyr. We have also been monitoring the absolute astrometric motions of the system using the VLT FORS2 optical imager since August 2005 to determine the individual masses. We predict a periastron passage in early 2010, by which time the system mass will be constrained to < 1 MJup and we will be able to determine the individual masses accurately in a dynamical, model-independent manner.
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