Multi-wavelength investigations on Galactic star forming regions

L. K. Dewangan1*
1Physical Research Laboratory, Navrangpura, Ahmedabad, India

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The thesis presents photometric study of several galactic star forming regions including High mass protostellar objects (HMPOs) and Ultracompact HII Regions (UCHIIs). Spectral Energy Distribution (SED) modeling is done for the infrared counterparts of outflow driving engines from HMPO samples and the driving engines of the UCHII regions. We derive the driving engine outflow relationships for a sample of HMPOs and characterize the physical properties of driving engines of the UCHII regions. Our study shows that the modeled disk accretion rates associated with HMPO samples are two orders of magnitude smaller than the envelope accretion rates and can not explain the observed mass loss rates. Therefore it is the mass accreted in the envelope that appears to contribute to the outflow entrainment rate. Our SED modeling results related to the driving engines of the UCHII regions predict very high (envelope) accretion rates, even without taking ionized accretion flows into account. We also present the photometric analysis of archival Spitzer-IRAC images, and the ratio maps on three massive star-forming (MSF) regions, which are included in the study of clustering of young stellar objects (YSOs), the interaction and feedback of massive stars to their immediate environments.

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Keywords :stars: formation – infrared: stars – infrared: ISM