A Survey for New Members of Taurus with the Spitzer Space Telescope
A Survey for New Members of Taurus with the Spitzer Space Telescope
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用斯皮策太空望远镜对金牛座新成员进行的调查
DOI：
10.1086/505572
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
E. Churchwell
中科院分区：
文献类型：
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作者：
K. Luhman;Barbara A. Whitney;M. Meade;B. Babler;R. Indebetouw;S. Bracker;E. Churchwell
我们提出了一个新的成员的金牛座恒星形成区使用红外线阵列相机（IRAC）船上的斯皮策太空望远镜的搜索结果。利用金牛座在3.6、4.5、5.8和8.0 μm处的29.7 ° 2的IRAC图像，我们已经确定了具有红色中红外颜色的源，这些红色中红外颜色指示盘状物体，并获得了其中23个候选成员的光学和红外光谱。通过这项工作，我们发现了13个金牛座的新成员，其中两个的光谱类型晚于M6，因此很可能是棕矮星，根据Chabrier和Baraffe的理论演化模型。这项调查表明，以前的金牛座人口普查有一个完整的约80%的成员与磁盘。我们发现的新成员并没有显着修改先前测量的金牛座成员的分布作为位置，质量和灭绝的函数。例如，我们没有发现以前的光学和近红外观测所遗漏的高度红化的棕矮星（AK ~ 2）的证据，这表明棕矮星盘并不比恒星周围的盘更明显地燃烧。除了新成员，我们还提出了IRAC测光的149个以前已知的成员，出现在这个调查，其中包括27个对象晚于M6。
We present the results of a search for new members of the Taurus star-forming region using the Infrared Array Camera (IRAC) aboard the Spitzer Space Telescope. With IRAC images of 29.7 deg2 of Taurus at 3.6, 4.5, 5.8, and 8.0 μm, we have identified sources with red mid-infrared colors indicative of disk-bearing objects and have obtained optical and infrared spectra of 23 of these candidate members. Through this work, we have discovered 13 new members of Taurus, two of which have spectral types later than M6 and thus are likely to be brown dwarfs, according to the theoretical evolutionary models of Chabrier & Baraffe. This survey indicates that the previous census of Taurus has a completeness of ~80% for members with disks. The new members that we have found do not significantly modify the previously measured distributions of Taurus members as a function of position, mass, and extinction. For instance, we find no evidence for a population of highly reddened brown dwarfs (AK ~ 2) that has been missed by previous optical and near-infrared surveys, which suggests that brown dwarf disks are not significantly more flared than disks around stars. In addition to the new members, we also present IRAC photometry for the 149 previously known members that appear within this survey, which includes 27 objects later than M6.