Name: Lokesh Dewangan
Affiliation: Physical Research Laboratory, Ahmedabad, India
Conference ID : ASI2022_104
Title : How do massive O-type stars form
Authors : Dr. Lokesh Kumar Dewangan
Abstract Type: Invited
Abstract Category : Stars, ISM and Galaxy
Abstract : Massive O-type stars (M > 15 Msun) at the end of their lifetimes explode as supernovae, which are ultimately responsible for enriching heavy elements to the interstellar medium (ISM) and and the left out extremely densely packed remnants are believed to form neutron stars and black holes. Such stars have a significant impact on the evolution of galaxies and the universe in general through their energetics. However, despite their importance, the exact formation mechanisms of massive O-type stars are not fully understood. In recent years, several multi-wavelength large-scale surveys reveal the common presence of hub-filament systems (HFSs) in massive star-forming regions. In such HFSs, several parsec-scale filaments are directed to the central denser regions hosting massive stars. Hence, the study of massive star formation requires a careful investigation of the inner environments of the central hub in HFSs. In this talk, I will present several important observational findings of HFSs covering large to small spatial scales, which provide new insights into the formation of the massive O-type stars. It includes the discovery of a disk-outflow system (extent ~800 AU to 9000 AU) around the rare young O-type protostar. I will also discuss the implication of the findings to current theoretical ideas of the most massive star formation.