arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.07305astro-ph.SRastro-ph.GA
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M10和M71的内部激酶

Internal Kinematics of M10 and M71

N. A. Barth, J. M. Gerber, O. M. Boberg, E. D. Friel, E. Vesperini

摘要:

我们提出了一个研究的内部运动学的两个球状星团,M10(NGC 6254)和M71(NGC 6838),使用单独的径向速度(RV)的测量获得的观测使用水螅多目标光谱仪上的WIYN 3.5米望远镜。我们测量了M10中120颗恒星的RV,其中107颗被确定为星团成员。在M71中,我们测量了82个RV,并确定其中78个测量值属于集群成员。使用簇成员,我们确定$75.9 \pm 4.0$(s.d.)km s $^{-1}$和$-22.9 \pm 2.2$(s.d.)km s $^{-1}$(M10和M71)。我们将Hydra RV测量与文献样本相结合,并对两个集群进行了视线旋转分析。我们的分析并没有发现一个统计上显着的旋转,在这些集群与内部区域(10 \arcsec - 117 \arcsec)的M10的例外,我们发现一个轻微的显着旋转幅度为V $_{rot} = 1.14 \pm 0.18$公里秒$^{-1}$的提示。对于M10,我们计算了中心速度色散$σ_{0} = 5.44 \pm 0.61$ km s $^{-1}$,它给出了旋转幅度与中心速度色散$V_{rot}/σ_{0} = 0.21 \pm 0.04$的比率。我们还探索了M10和M71中发现的多个恒星星族的旋转,发现每个恒星族的旋转(或缺乏旋转)彼此一致,并与星团的全球旋转特征一致。

英文摘要:

We present a study of the internal kinematics of two globular clusters, M10 (NGC 6254) and M71 (NGC 6838), using individual radial velocity (RV) measurements obtained from observations using the Hydra multi-object spectrograph on the WIYN 3.5 m telescope. We measured 120 RVs for stars in M10, of which 107 were determined to be cluster members. In M71, we measured 82 RVs and determined 78 of those measurements belonged to cluster members. Using the cluster members, we determine a mean RV of $75.9 \pm 4.0$ (s.d.) km s$^{-1}$ and $-22.9 \pm 2.2$ (s.d.) km s$^{-1}$ for M10 and M71, respectively. We combined the Hydra RV measurements with literature samples and performed a line-of-sight rotational analysis on both clusters. Our analysis has not revealed a statistically significant rotation in either of these clusters with the exception of the inner region (10\arcsec - 117\arcsec) of M10 for which we find hints of a marginally significant rotation with amplitude V$_{rot} = 1.14 \pm 0.18$ km s$^{-1}$. For M10, we calculate a central velocity dispersion of $σ_{0} = 5.44 \pm 0.61$ km s$^{-1}$, which gives a ratio of the amplitude of rotation to the central velocity dispersion $V_{rot}/σ_{0} = 0.21 \pm 0.04$. We also explored the rotation of the multiple stellar populations identified in M10 and M71 and found rotation (or lack thereof) in each population consistent with each other and the cluster global rotation signatures.

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