Stellar Population and Star Formation History of the Distant Galactic H II Regions NGC 2282 and Sh2-149

We present here the recent results on two distant Galactic H II regions, namely NGC 2282 and Sh2-149, obtained with multiwavelength observations. Our optical spectroscopic analysis of the bright sources have been used to identify the massive members, and to derive the fundamental parameters such as age and distance of these regions. Using IR color-color criteria and H alpha-emission properties, we have identified and classified the candidate young stellar objects (YSOs) in these regions. The (CO)-C-12(1-0) continuum maps along with the K-band extinction maps, and spatial distribution of YSOs are used to investigate the structure and morphology of the molecular cloud associated with these H II regions. Overall analysis of these regions suggests that the star formation occurs at the locations of the denser gas, and we also find possible evidences of the induced star formation due to the feedback from massive stars to its surrounding molecular medium.S N Bose National Centre for Basic Sciences under Department of Science and Technology, Govt. of IndiaCPCI-S(ISTP)85-8951