A comparative study of star formation processes in different environments

TL;DR

This thesis compares star formation in high and low metallicity environments, revealing similarities in stellar cluster properties despite differing metallicities, challenging existing stellar evolution models.

Contribution

It identifies two distinct star formation sites in galaxies and compares their properties, highlighting unexpected similarities that question current stellar evolution predictions.

Findings

High metallicity star formation occurs in super stellar clusters.

Ionization structures are similar across different metallicities.

Results challenge existing stellar evolution models.

Abstract

In this thesis we have identified two star formation sites for star formation in galaxies which differ widely in metal content. We conclude that `massive' star formation that occurs in a high density, high metallicity environment, like that encountered in circumnuclear star-forming regions, takes place in systems that comply to the definition of super stellar clusters and that are arranged in star forming complexes. These complexes have Halpha luminosities, and therefore masses of ionizing stars, that overlap at the lower end with those found in HII galaxies, which have a much lower metallicity. The fact that their ionization structure and the temperature of their ionizing radiation field are very similar, point to stellar clusters in these two environments which have the same equivalent effective temperature. This is contrary to what is expected from stellar evolution models which predict lower stellar effective temperatures in high metallicity regions.