Southern infrared proper motion survey I. Discovery of new high proper motion stars from first full hemisphere scan
Southern infrared proper motion survey I. Discovery of new high proper motion stars from first full hemisphere scan
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南方红外自行巡天 I. 首次全半球扫描发现新的高自行运动恒星
DOI：
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发表时间：
2004
期刊：
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通讯作者：
J. Cooke
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作者：
N. Deacon;N. Hambly;J. Cooke
我们介绍了南方红外自行调查的第一批结果。利用2微米全天巡天的数据和超宇宙巡天的数据，我们已经能够产生第一个宽视场红外自行测量。有针对性地识别附近的M、L和T型矮星，我们已经发现了70个这样的新天体，它们的自行超过0.5��/年，其中10个的自行超过1��/年。这些天体中最有趣的是SIPS1259-4336，一颗晚期的M矮星。我们计算了该天体的三角视差π=276±41毫弧秒，距离为3.62±0.54pC。我们还用LHS 128发现了一个常见的自行三系和一个具有共同自行的物体。调查的完整性受到许多2MASS和UKI观测之间微小的纪元差异的限制。因此，我们只用有利的光度法回收了22%的Luyten天体。然而，Luyten的研究本身是无法量化的不完整。我们讨论了通过降低自行下限来增加调查数量的前景。
We present the first results from the Southern Infrared Proper Motion Survey. Using 2 Micron All Sky Survey data along with that of the SuperCOSMOS sky survey we have been able to produce the first widefield infrared proper motion survey. Having targeted the survey to identify nearby M, L and T dwarfs we have discovered 70 such new objects with proper motions greater than 0.5 �� /yr with 10 of these having proper motions in excess of 1 �� /yr. The most interesting of these objects is SIPS1259-4336 a late M dwarf. We have calculated a trigonometric parallax for this object of π = 276±41 milliarcsec yielding a distance of 3.62 ± 0.54 pc. We have also discovered a common proper motion triple system and an object with a common proper motion with LHS 128. The survey completeness is limited by the small epoch differences between many 2MASS and UKI observations. Hence we only recover 22% of Luyten objects with favourable photometry. However the Luyten study is itself unquantifiably incomplete. We discuss the prospect of enhancing the survey volume by reducing the lower proper motion limit.