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SiO and H_2O Maser Observations of Red Supergiants in Star Clusters Embedded in the Galactic Disk

机译:银星盘内星团中红色超巨星的SiO和H_2O Maser观测

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We present the results of radio observations of red supergiants in a star cluster, Stephenson (1990, AJ, 99, 1867 )'s #2, and of candidates for red supergiants in three star clusters, Mercer et al. (2005, ApJ, 635, 560)'s #4, #8, and #13, in the SiO and H_2O maser lines. The Stephenson's #2 cluster and nearby aggregation at the southwest contain more than 15 red supergiants. We detected one red supergiant at the center of Stephenson's #2 and three in a southwest aggregation in the SiO maser line; three out of these four were also detected in the H_2O maser line. The average radial velocity of the four detected objects is 97 km s~(-1), giving a kinematic distance of 5.5 kpc, which locates this cluster near the base 6f the Scutum-Crux spiral arm. We also detected six SiO emitting objects associated with other star clusters. In addition, mapping observations in the CO J 1-0 line toward these clusters revealed that an appreciable amount of molecular gas still remains around the Stephenson's #2 cluster in contrast to the prototypical redsupergiant cluster, Bica et al. (2003, A&A, 404, 223)'s #122. This indicates that the time scale of gas expulsion differs considerably in individual clusters.
机译:我们提出了在星团Stephenson(1990,AJ,99,1867)的#2中的红色超巨星的无线电观测结果以及在三个星团中的红色超巨星的候选者的观测结果,Mercer等。 (2005,ApJ,635,560)的SiO和H_2O maser线中的#4,#8和#13。斯蒂芬森(Stephenson)的#2集群和西南附近的聚集体包含15个以上的红色超级巨人。我们在史蒂芬森2号中心发现了一个红色超巨星,在SiO maser线的西南集合中发现了3个;在H_2O maser线中也检测到四分之三。四个检测到的物体的平均径向速度为97 km s〜(-1),运动距离为5.5 kpc,使该簇位于Scutum-Crux螺旋臂底部6f附近。我们还检测到六个与其他星团相关的SiO发射物体。此外,在CO J 1-0线中对这些簇的映射观察结果表明,与原型红色超巨型簇Bica等相反,在斯蒂芬森#2簇周围仍然有相当数量的分子气体。 (2003,A&A,404,223)#122。这表明在各个集群中,气体排出的时间尺度差异很大。

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