UKIRT follow-up observations of the old open cluster FSR 0358 (Kirkpatrick 1)

UKIRT follow-up observations of the old open cluster FSR 0358 (Kirkpatrick 1)
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UKIRT 对旧疏散星团 FSR 0358(柯克帕特里克 1)的后续观测

DOI:
10.1111/j.1365-2966.2009.14680.x
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发表时间:
2009
影响因子:
4.8
通讯作者:
Froebrich D
Froebrich D
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Froebrich D

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我们的目标是描述银河系中恒星团的特性。利用期望最大化方法,我们确定最初由 J.D. Kirkpatrick 发现的簇 FSR 0358 是 Froebrich 等人的候选簇中最有可能的真实簇。在这里,我们展示了使用英国红外望远镜(UKIRT)获得的该物体的新深度高分辨率近红外成像。对数据的分析表明,FSR 0358(柯克帕特里克1)是位于银河系外的一个5±2Gyr的古老疏散星团。它的年龄、金属丰度 Z= 0.008 和距银河中心 11.2 kpc 的距离是已知的古老疏散星系团的典型特征。迄今为止,已确定 6 个 FSR 星团候选者的年龄超过 5 吉里。这表明该星表对于增强我们对银河系最古老的疏散星团的了解具有重要意义。
We aim to characterize the properties of the stellar clusters in the Milky Way. Utilising an expectation-maximization method, we determined that the cluster FSR 0358, originally discovered by J.D. Kirkpatrick, is the most likely real cluster amongst the cluster candidates from Froebrich et al. Here, we present new deep high resolution near-infrared imaging of this object obtained with the United Kingdom Infrared Telescope (UKIRT). The analysis of the data reveals that FSR 0358 (Kirkpatrick 1) is a 5 ± 2 Gyr old open cluster in the outer Milky Way. Its age, metallicity ofZ= 0.008 and distance from the Galactic Centre of 11.2 kpc are typical for the known old open galactic clusters. So far six of the FSR cluster candidates have been identified as having an age above 5 Gyr. This shows the significance of this catalogue in enhancing our knowledge of the oldest open clusters in the Galaxy.
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