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首页> 外文期刊>The Astrophysical journal >A MASSIVE CLUSTER OF RED SUPERGIANTS AT THE BASE OF THE SCUTUM-CRUX ARM
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A MASSIVE CLUSTER OF RED SUPERGIANTS AT THE BASE OF THE SCUTUM-CRUX ARM

机译：基于SCUTUM-CRUX ARM的大量红色超级花絮

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摘要

We report on the unprecedented red supergiant (RSG) population of a massive young cluster, located at the base of the Scutum-Crux Galactic arm. We identify candidate cluster RSGs based on 2MASS photometry and medium-resolution spectroscopy. With follow-up high-resolution spectroscopy, we use CO band-head equivalent width and high-precision radial velocity measurements to identify a core grouping of 26 physically associated RSGs-the largest such cluster known to date. Using the stars' velocity dispersion and their inferred luminosities in conjunction with evolutionary models, we argue that the cluster has an initial mass of ～40,000 M_☉ and is therefore among the most massive in the galaxy. Further, the cluster is only a few hundred parsecs away from the cluster of 14 RSGs recently reported by Figer at al.. These two RSG clusters represent 20% of all known RSGs in the Galaxy, and now offer the unique opportunity to study the presupernova evolution of massive stars, and the blue- to red-supergiant ratio at uniform metallicity. We use GLIMPSE, MIPSGAL, and MAGPIS survey data to identify several objects in the field of the larger cluster which seem to be indicative of recent regionwide starburst activity at the point where the Scutum-Crux arm intercepts the Galactic bulge. Future abundance studies of these clusters will therefore permit the study of the chemical evolution and metallicity gradient of the Galaxy in the region where the disk meets the bulge.
机译：我们报告了位于Scutum-Crux Galactic臂基部的大规模年轻星团空前的红色超巨星（RSG）种群。我们基于2MASS光度法和中分辨率光谱学确定候选簇RSG。通过后续的高分辨率光谱学，我们使用CO带头等效宽度和高精度径向速度测量结果来确定26个与物理相关的RSG的核心分组，这是迄今为止已知的最大此类集群。利用恒星的速度色散及其推断的光度，结合演化模型，我们认为该星团的初始质量约为40,000M_☉，因此是银河系中质量最大的星团。此外，该星团距离Figer等人最近报道的14个RSG星团只有几百秒差距。这两个RSG星团代表银河系中所有已知RSG的20％，现在为研究超新星前提供了独特的机会大质量恒星的演化，以及均匀金属度下的蓝色至红色超大比例。我们使用GLIMPSE，MIPSGAL和MAGPIS调查数据来识别较大星团区域中的几个物体，这些物体似乎表明最近的区域星暴活动发生在Scutum-Crux臂拦截银河凸起的位置。因此，对这些星团的未来丰度研究将允许研究在圆盘遇到隆起的区域中银河系的化学演化和金属性梯度。

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