Periodic Reporting for period 1 - STAREX (STARs at the EXtreme)
Reporting period: 2020-01-01 to 2021-06-30
- First models including the impact of the convective boundary mixing have been obtained in collaboration with the Keele team.
- Some recent published formalism for improving the transport of angular momentum in radiative zones has been tested. We showed that a detailed comparison with asteroseismic data still shows significant discrepancies that need to be addresses
- First consistent comparisons have been performed between models and observations to deduce empirically the size of the convective cores in initial masses between 9 and 25 solar masses.
- A new method has been proposed to determine the maximum mass of supermassive stars obtained as well as the impact of rotation on these maximum masses.
- We suggested a new scenario for the formation of the CEMP-no stars invoking an enrichment due to, at the moment still speculative, stellar winds of Pop III stars. We studied the binary statistics in the first stellar clusters in the Universe with a new approach.
- We proposed a new method for studying the link between the surface properties of a star and its internal structure based on what we called Snapshot models. This method will be used to produce a pre-supernova library that will be unique and exhaustive in term of the different internal structures that it will provide associated with light curve evolution and spectral evolution.
The main aims that we want achieve until the end of the project are: To Identify the physics that is still missing for reliably describing the transport of angular momentum, to predict observational signature of supermassive stars. to explore the impact of candidate dark matter particles on the evolution of Pop III massive and supermassive stars, to predict observational signature of the first stellar populations, to predict the frequency and properties of the energetic transient events from the first stellar generations.