UBV photometry in RCW173
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The discovery of several clusters of red supergiants towards l=24{deg}-30{deg} has triggered interest in this area of the Galactic plane, where lines of sight are very complex...
在银经l=24°至30°的天区内发现数个红超巨星星团，这一发现引发了学界对银河系盘面该区域的研究兴趣——该天区的视线方向结构极为复杂……
