小麦哲伦星云中KRON 3的UVIT-HST-Gaia-VISTA研究：UV中具有扩展红色团块的星团
UVIT-HST-Gaia-VISTA study of KRON 3 in the Small Magellanic Cloud: A cluster with an extended red clump in UV
摘要：
我们已经证明了结合多波长观测的优势，从紫外（UV）到近红外，研究Kron 3，小麦哲伦星云中的一个大质量星团。我们估计星团Kron 3的半径为2。首次报道了NUV-亮红团簇星的鉴别以及NUV-亮红团簇星的色星等图（CMD）中的色星等和色星等的扩展。我们发现，扩展的RC是一个固有的属性的集群，它不是由于污染的领域的明星或微分红跨领域。我们研究了RC星的光谱能量分布，估计了它们的温度在5000 - 5500 K之间，光度在60 - 90之间，半径在8.0 - 11.0之间，支持了它们的RC性质。RC星的UV星等范围（~23.3到24.8等）可能是由可变质量损失、初始氦丰度的变化（Y_ini=0.23到0.28）以及年龄（6.5-7.5 Gyr）和金属丰度（[Fe/H]=-1.5到-1.3）的微小变化的综合影响造成的。对Kron 3中RC星的光谱跟踪观测对于确认RC扩展的原因是必要的。
英文摘要：
We have demonstrated the advantage of combining multi-wavelength observations, from the ultraviolet (UV) to near-infrared, to study Kron 3, a massive star cluster in the Small Magellanic Cloud. We have estimated the radius of the cluster Kron 3 to be 2.'0 and for the first time, we report the identification of NUV-bright red clump (RC) stars and the extension of the RCin colour and magnitude in the NUV vs (NUV-optical) colour-magnitude diagram (CMD). We found that extension of the RC is an intrinsic property of the cluster and it is not due to contamination of field stars or differential reddening across the field. We studied the spectral energy distribution of the RC stars and estimated a small range in temperature ~5000 - 5500K, luminosity ~60 - 90 Land radius ~8.0 - 11.0 Supporting their RC nature. The range of UV magnitudes amongst the RC stars (~23.3 to 24.8 mag) is likely caused by the combined effect of variable mass loss, variation in initial helium abundance (Y_ini=0.23 to 0.28), and a small variation in age (6.5-7.5 Gyr) and metallicity ([Fe/H]=-1.5 to -1.3). Spectroscopic follow-up observations of RC stars in Kron 3 are necessary to confirm the cause of the extended RC.
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