12.08.2020 10:00

Promotionskolloquium Tereza Jerabkova

Stellar populations in gravitationally bound systems


Stars form in dense sub-parsec regions of molecular clouds, while at the same time, star-forming regions are inevitably coupled to the galactic gravitational potential. This talk will address the complex multi-scale physical nature of star-formation by combining a detailed investigation of resolved star-forming regions using Gaia data with theoretical modelling of stellar populations. In particular, the discovery and my confirmation and theoretical explanation of the unexpected existence of three stellar populations in the young Orion Nebula Cluster present a clear example of the importance of pc-scale processes such as stellar dynamics on star and star-cluster formation. Furthermore, I will present the discovery, made possible with the advent of the Gaia space mission, of 100-pc long and few-pc thin co-eval filaments of star formation, a new fact posing novel viable constraints for theories of star-formation. Using these and previous constraints on star-formation, I build bridges to the galactic scales using the Integrated Galactic Initial Mass Funtion (IGIMF) theory. The publicly available code, GalIMF, has been co-developed within my doctoral studies to synthesise stellar populations of whole galaxies. This allowed me to compute, for the first time, a large grid of the empirically driven variable galaxy-wide stellar initial mass function for direct comparison with observations. This modelling and the associated codes were used, for example, to construct the cosmic star-formation history with a variable stellar-initial mass function. In a nutshell, I aim to present a multi-scale and multi-technique contribution to star-formation and stellar populations opening novel and original routes for future research.


The talk will be held as a Zoom meeting. If you would like to take part, please contact Prof. Kroupa for the invitation details (pavel@astro.uni-bonn.de)


Kategorie: HISKP News, Promotionskolloquium