演講資訊

摘要：

The interaction between massive ionizing sources (O and early Btype) with their natal molecular environment plays a constructive role of new generation star formation via. various mechanism e.g., Radiation Driven Implosion, collect & collapse process etc. The aim of this colloquium is to understand some aspects of interaction of high and low mass stars with their environment on the basis of observational evidences of massive ionizing sources, young stellar contents and molecular/ionized gas properties. Multiwavelength studies of H II regions provide census of YSOs, their fundamental parameters e.g. masses, ages, effective temperatures, circumstellar disks around them etc. From such parameter space, broad pictures emerge on the young starforming regions (SFRs) like starformation history, star formation efficiency, timescales etc. We studied the stellar contents and star formation activities of three distant Galactic H II regions (e.g. NGC 2282, Sh2149 complex, Cygnus OB7) using deep optical, near Infrared (NIR), mid Infrared (MIR) and radio continuum observations. We estimated the stellar content of NGC 2282, a young cluster in the Monoceros constellation, using deep optical BVI and IPHAS photometry along with IR data from UKIDSS and SpitzerIRAC. With the aim of investigating star formation mechanism, we studied a Galactic H II region Sh2149 and associated molecular clouds. We performed CCD Iband time series photometry of a young cluster NGC 2282 and Lynds 1003 cloud in Cygnus OB7 to identify and characterize the variability of pre mainsequence (PMS) stars.