Spectroscopic confirmation of the low-latitude object FSR 1716 as an old globular cluster

Spectroscopic confirmation of the low-latitude object FSR 1716 as an old globular cluster
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低纬度天体 FSR 1716 为古老球状星团的光谱确认

DOI:
10.1051/0004-6361/201731771
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发表时间:
2017
影响因子:
6.5
通讯作者:
Kunder
Kunder
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Kunder

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星星团是银河系组成部分的宝贵示踪剂,低质量恒星系统的发现和表征可以用来评估其主导的破坏机制和时间尺度。然而,由于显著的前景污染,高消光,以及银河系底层成分的未知界面,低银河系纬度的物体非常难以表征。在这里,我们提出了第一个光谱活动,以确定低纬度星星集群FSR 1716的化学动力学性质。虽然它的光度年龄和距离还远未确定,但天琴座RR型变星的存在表明它是一个相当古老的星团。利用宽视场多光纤AAOmega仪器获得的中等分辨率(R~ 10 600)钙三重态(CaT)光谱,我们确定了6个候选成员,平均速度为−30 km s-1,速度色散为2.5 ± 0.9 km s-1。后一个数值意味着它的动力学质量约为1.3 × 104 M,这是一个典型的低质量球状星团。结合我们推导出的CaT金属丰度为−1.38 ± 0.20 dex,该天体最终被确认为一个古老的贫金属球状星团。
Star clusters are invaluable tracers of the Galactic components and the discovery and characterization of low-mass stellar systems can be used to appraise their prevailing disruption mechanisms and time scales. However, owing to significant foreground contamination, high extinction, and still uncharted interfaces of the underlying Milky Way components, objects at low Galactic latitudes are notoriously difficult to characterize. Here, we present the first spectroscopic campaign to identify the chemodynamical properties of the low-latitude star cluster FSR 1716. While its photometric age and distance are far from settled, the presence of RR Lyrae variables indicates a rather old cluster variety. Using medium-resolution (R~ 10 600) calcium triplet (CaT) spectroscopy obtained with the wide-field, multi-fiber AAOmega instrument, we identified six member candidates with a mean velocity of −30 km s-1and a velocity dispersion of 2.5 ± 0.9 km s-1. The latter value implies a dynamic mass of ~ 1.3 × 104M⊙, typical of a low-mass globular cluster. Combined with our derived CaT metallicity of −1.38 ± 0.20 dex, this object is finally confirmed as an old, metal-poor globular cluster.
盖亚1星团的化学成分:天狼星背后并不奇怪
DOI: --
发表时间: 2017
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