（234）第一个野蛮人芭芭拉的非凸形
The non-convex shape of (234) Barbara, the first Barbarian
摘要：
小行星（234）芭芭拉是一类小行星的原型，已被证明是极其丰富的耐火夹杂物，最古老的材料在太阳系发现。它具有几个独特的特征，最显著的是它的偏振行为。近年来，其他拥有相同属性的物体（统称为“野蛮人”）也被发现。ESO VLTI的中红外线干涉观测表明，（234）芭芭拉可能有一个双叶形状，甚至可能有一个大型的伴星。我们使用1979年至2014年之间获得的57个光学光变曲线，以及2009年两次恒星掩星的时间，使用两种不同的形状重建算法来确定（234）Barbara的旋转周期，自旋矢量坐标和三维形状。通过将光变曲线与恒星掩星的结果相结合，我们能够证明（234）Barbara的形状具有很大的凹区。可能的链接的形状的极化特性和对象的演变进行了讨论。我们还表明，VLTI数据可以建模没有卫星的存在。
英文摘要：
Asteroid (234) Barbara is the prototype of a category of asteroids that has been shown to be extremely rich in refractory inclusions, the oldest material ever found in the Solar System. It exhibits several peculiar features, most notably its polarimetric behavior. In recent years other objects sharing the same property (collectively known as "Barbarians") have been discovered. Interferometric observations in the mid-infrared with the ESO VLTI suggested that (234) Barbara might have a bi-lobated shape or even a large companion satellite. We use a large set of 57 optical lightcurves acquired between 1979 and 2014, together with the timings of two stellar occultations in 2009, to determine the rotation period, spin-vector coordinates, and 3-D shape of (234) Barbara, using two different shape reconstruction algorithms. By using the lightcurves combined to the results obtained from stellar occultations, we are able to show that the shape of (234) Barbara exhibits large concave areas. Possible links of the shape to the polarimetric properties and the object evolution are discussed. We also show that VLTI data can be modeled without the presence of a satellite.
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