A list of bright interferometric calibrators measured at the European Southern Observatory Very Large Telescope Interferometer
A list of bright interferometric calibrators measured at the European Southern Observatory Very Large Telescope Interferometer
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欧洲南方天文台甚大望远镜干涉仪测量的明亮干涉校准器列表
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
J. Davis
中科院分区：
文献类型：
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作者：
A. Richichi;I. Percheron;J. Davis
在以前的出版物中，我们描述了欧洲南方天文台甚大望远镜干涉仪（VLTI）的候选校准星的观测计划，并从统计的角度提出了主要结果。在本文中，我们专注于建立一个新的均匀组明亮的干涉校准，完全基于公开可用的K波段VLTI观测与芬奇仪器进行到2004年7月。为此，我们针对观察结果的质量和数量定义了一些选择标准，并相应地选择了17个一级校准品和47个二级校准品。我们已经开发了一种方法，使用整个体积的质量控制数据，在很大程度上独立于先验假设的角直径的一个强大的全球拟合。我们的研究结果进行了比较，直接测量，间接估计的基础上分光光度法，和一般协议被发现在合并的不确定性。我们列表中的恒星亮度范围为K = -2.9到+3.0等，均匀圆盘直径为1.3-20.5等。一级和二级校准器的角直径值的相对准确度平均分别为0.4%和2%。我们的校准器非常适合于基线在200米至200米之间的近红外干涉观测，其精度优于其他类似的星表，至少对于初级校准器而言是如此。因此，目前的校准品清单有可能导致显著改善干涉测量的科学结果。
In a previous publication, we described a program of observations of candidate calibrator stars at the European Southern Observatory Very Large Telescope Interferometer (VLTI), and presented the main results from a statistical point of view. In the present paper, we concentrate on establishing a new homogeneous group of bright interferometric calibrators, based entirely on publicly available K-band VLTI observations carried out with the VINCI instrument up to 2004 July. For this, we have defined a number of selection criteria for the quality and volume of the observations, and we have accordingly selected a list of 17 primary and 47 secondary calibrators. We have developed an approach to a robust global fit for the angular diameters using the whole volume of quality-controlled data, largely independent of a priori assumptions. Our results have been compared with direct measurements, and indirect estimates based on spectrophotometric methods, and general agreement is found within the combined uncertainties. The stars in our list cover the range K = -2.9 to +3.0 mag in brightness, and 1.3-20.5 mas in uniform-disc diameter. The relative accuracy of the angular diameter values is on average 0.4 and 2 per cent for the primary and secondary calibrators, respectively. Our calibrators are well suited for interferometric observations in the near-infrared on baselines between ≈20 and 200 m, and their accuracy is superior, at least for the primary calibrators, to other similar catalogues. Therefore, the present list of calibrators has the potential to lead to significantly improved interferometric scientific results.