Rotational effects in the system of proper motions of the UCAC3 catalogue
Rotational effects in the system of proper motions of the UCAC3 catalogue
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DOI：
10.1111/j.1365-2966.2011.19389.x
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发表时间：
2011-11
影响因子：
4.8
通讯作者：
V. Bobylev;M. Khovritchev
中科院分区：
文献类型：
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作者：
V. Bobylev;M. Khovritchev
UCAC3 目录中的一组约 800 万颗单星已被分析。它包含具有可靠自行的恒星，并且用于计算自行的观测不少于三个纪元。我们的主要目标是研究 UCAC3 目录中“好”星定义的参考系统的惯性。矢量球谐函数的形式已被应用于分析所选 UCAC3 恒星的自行系统。 UCAC3恒星几个子集的解结果的比较表明，关键参数随着恒星星等、颜色和平均距离的变化而显着变化。依帕谷天体参考系 (HCRF) 的刚体旋转矢量分量相对于河外源的值是使用 UCAC3 目录中 8000 多个星系的“自行”确定的。在银河系坐标中，这些值为 ω1 = 0.58 ± 0.15、ω2 =− 1.02 ± 0.15、ω3 =− 0.59 ± 0.17 mas yr −1。在 UCAC3 星系的“自行”中可以看到相当大的星等方程的痕迹。从 UCAC3 星系分析中得出的最重要的组成部分是 ω2。它与所选恒星自行运动的分析结果并不矛盾 (ω2 =− 1.09 ± 0.02 mas yr −1 )。
A set of ≈8 million single stars of the UCAC3 catalogue has been analysed. It contains stars with reliable proper motions with not less than three epochs of observations used to compute the proper motion. Our main goal is to investigate the inertiality of the reference system defined by ‘good’ stars of the UCAC3 catalogue. The formalism of vectorial spherical harmonics has been applied to analyse the system of proper motions of the selected UCAC3 stars. A comparison between the results of solutions for several subsets of UCAC3 stars shows that the key parameters significantly change with stellar magnitudes, colours and average distances. The values of the components of the rigid-body rotation vector of the Hipparcos Celestial Reference Frame (HCRF) with respect to extragalactic sources were determined using ‘proper motions’ of more than 8000 galaxies of the UCAC3 catalogue. The values are ω1 = 0.58 ± 0.15, ω2 =− 1.02 ± 0.15, ω3 =− 0.59 ± 0.17 mas yr −1 in galactic coordinates. Traces of the considerable magnitude equation are seen in the ‘proper motions’ of the UCAC3 galaxies. The most significant component derived from the analysis of the UCAC3 galaxies is ω2. It does not contradict the results of the analysis of the proper motions of selected stars (ω2 =− 1.09 ± 0.02 mas yr −1 ).