Hydrogen Content of Young Stellar Clusters. III. Clusters NGC3293, 6167, 6193, 6200, and 6204

Abstract

The total amount of hydrogen associated with the O-type clusters NGC 3293, 6193, and 6204 and the suspected clusters NGC6167 and 6200 has been measured. Neither neutral nor ionized hydrogen was found to be associated with NGC 3293 and the visible nebula in this region is most likely associated with a single 07-type star, which does not appear to belong to the cluster, while an irregular expanding shell of neutral hydrogen probably surrounds the ionized nebula. The mass of hydrogen associated with NGC6193 does not exceed 500MQ? Neither neutral nor ionized hydrogen was detected at the position ofNGC 6204. The features detected by hydrogenline observations at the positions of suspected clusters NGC6167 and 6200 provide evidence that both visual groupings may be real clusters. The amount of neutral hydrogen probably connected with NGC6167 is ~ 1000 M Q ?