Absolute proper motions of globular clusters
Absolute proper motions of globular clusters
复制标题
球状星团的绝对自行
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
A. K. Dambis
中科院分区：
文献类型：
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作者：
A. K. Dambis
银河系总共 92 个球状星团（占 Harris 发布的星表中包含的所有星团的 60%）的绝对自行运动是根据其可能成员恒星的 UCAC2 自行推断的。在赤经和赤纬方面，星团自行的中位形式误差均等于 0.8 毫安秒·年−1，而单个星团的自行误差范围为 0.2 至 3 毫安秒·年−1。进行的测试证明了簇运动的整体有效性；平均而言，所产生的横向速度在日心距离 15 kpc 范围内几乎保持恒定，并且大多数星团相对于银心的全空间速度平均在 190 km s−1 附近保持不变，在银心距离约 20 kpc 范围内保持不变，这与银晕的整体等温结构一致。
The absolute proper motions for a total of 92 globular clusters of the Milky Way (60% of all clusters included in the catalogue published by Harris) are inferred from the UCAC2 proper motions of their likely member stars. The median formal error of the cluster proper motions is equal to 0.8 marcsec year−1 in both right ascension and declination, whereas the proper-motion errors of individual clusters range from 0.2 to 3 marcsec year−1. Tests performed demonstrate the overall validity of the cluster motions; the resulting transverse velocities remain, on the average, virtually constant out to a heliocentric distance of 15 kpc and the full space velocity of most of the clusters relative to the Galactic centre remains, on the average, unchanged near 190 km s−1 out to a Galactocentric distance of about 20 kpc, in agreement with the overall isothermal structure of the Galactic halo.