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首页> 外文期刊>The Astrophysical journal >CONSTRAINTS ON CIRCUMSTELLAR DISK MASSES IN THE TRAPEZIUM CLUSTER
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CONSTRAINTS ON CIRCUMSTELLAR DISK MASSES IN THE TRAPEZIUM CLUSTER

机译:约束梯形群中的盘状圆盘质量

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摘要

We present λ = 3.5 mm continuum observations of the Trapezium Cluster core obtained with the BIMA array with 1.8″ x 1.0″ resolution. Sixteen sources are detected at the 4 σ or greater level within a 45″ radius of field center. Four of these sources are coincident with previously proposed star-disk systems that show centimeter wavelength emission; their millimeter emission is consistent with the extrapolated free-free emission. Three additional sources are near stellar positions from a larger near-infrared survey. The nature of these sources and the remaining nine sources without stellar counterparts is uncertain. Considering the large number of proposed star-disk systems within our field (33) and the even larger number of cluster stars in the field (108), we conclude that massive circumstellar disks are not common in this cluster. Converting our flux limits to mass estimates, we restrict disk masses around individual sources to be ≤ 0.15 solar mass. Statistical analysis of the overall sample of possible sources suggests that the average disk mass is ≤ 0.03 solar mass. These limits are not Sufficiently strict to rule out the possibility that disks in the Trapezium Cluster have a similar mass distribution to those associated with stars forming in isolation or loose aggregates.
机译:我们提出了利用BIMA阵列以1.8英寸x 1.0英寸分辨率获得的梯形团簇核心的λ= 3.5毫米连续谱图。在场中心半径为45英寸的半径内,以4σ或更高的水平检测到16个源。这些源中的四个与先前提出的显示厘米波长发射的星盘系统一致;它们的毫米发射与外推的自由发射一致。另外三个来源是来自较大的近红外勘测的恒星位置附近。这些来源的性质以及其余九个来源不明确的来源均不确定。考虑到在我们的领域(33)中提议的星盘系统数量众多,并且在领域(108)中存在更多的星团星,我们得出结论,在这个星团中不存在大型的星际盘。将通量极限转换为质量估计值,我们将单个源周围的圆盘质量限制为≤0.15太阳质量。对所有可能来源的样本的统计分析表明,平均盘质量≤0.03太阳质量。这些限制不够严格,不能排除梯形星团中的盘具有与孤立形成的星团或疏散的聚集体相关的星团相似的质量分布的可能性。

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