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We present the result of radio observations of red supergiants in the starcluster, Stephenson's #2, and candidates for red supergiants in the starclusters, Mercer et al. (2005)'s #4, #8, and #13, in the SiO and H$_2$O maserlines.The Stephenson's #2 cluster and nearby aggregation at the South-Westcontain more than 15 red supergiants. We detected one at the center ofStephenson's #2 and three in the south-west aggregation in the SiO maser line,and three of these 4 were also detected in the H2O maser line. The averageradial velocity of the 4 detected objects is 96 km s^{-1}, giving a kinematicdistance of 5.5 kpc, which locates this cluster near the base of theScutum-Crux spiral arm. We also detected 6 SiO emitting objects associated withthe other star clusters. In addition, mapping observations in the CO J=1--0line toward these clusters revealed that an appreciable amount of molecular gasstill remains around Stephenson's #2 cluster in contrast to the prototypicalred-supergiant cluster, Bica et al.'s #122. It indicates that a time scale ofgas expulsion differs considerably in individual clusters.

SiO and H2O Maser Observations of Red Supergiants in Star Clusters Embedded in the Galactic Disk