Yields from AGB Stars and their Impact on the Chemical Evolution of Dwarf Galaxies

TL;DR

This study uses 2D chemodynamical simulations to explore how yields from AGB stars influence the chemical evolution of dwarf galaxies, highlighting the importance of yield choices on observed compositions and galaxy dynamics.

Contribution

It identifies the impact of different intermediate-mass star yields on chemical abundances and galaxy evolution in dwarf galaxies through detailed simulations.

Findings

Yield choices cause 0.3-0.6 dex differences in chemical abundances.

Galaxy dynamics are significantly affected by nucleosynthetic yield assumptions.

The best yield sets reproduce observed nitrogen abundances.

Abstract

By means of 2--D chemodynamical simulations, we study the evolution of dwarf galaxies with structural parameters similar to IZw18 and to tidal dwarf galaxies. Different sets of yields from intermediate-mass stars are tested, in order to discover which one best reproduces the observed chemical compositions (in particular for nitrogen). Different choices of yields from intermediate-mass stars lead to differences of up to 0.3--0.6 dex, depending on the assumptions. It is also shown that, given the dependence of the cooling function on the metallicity, the dynamics of galaxies is also significantly affected by the choice of nucleosynthetic yields.