Abstract
| Vasini |
|---|
| Galactic Archaelogy with [Mg/Mn] versus [Al/Fe] abundance ratios |
| In the recent literature the diagram [Mg/Mn] versus [AL/Fe] has been largely discussed, but not enough space is given to its limitations and uncertainties, in particular the nuclear ones. The choice of these four elements is based on their nuclear properties and on their astrophysical production sites. Since they are all produced by different progenitors, on different time scales and with different metallicity dependencies, their behaviour in the plane [Mg/Mn] versus [AL/Fe] can disentangle some information on the star formation history of the host galaxies. Our work is aimed at analyzing the uncertainties behind this diagram by adopting a chemical evolution model of the Milky Way that had already been tested (see Vasini et al. 2022). With our best model we predicted the abundances of Mg, Mn and Al and traced the behaviour of the Milky Way on the plane [Mg/Mn] vs [Al/Fe]. After a comparison with APOGEE DR17 data, we applied corrections to the yields in order to better reproduce the abundance pattern. By studying the [Mg/Mn] vs [Al/Fe] plots in the two cases tested, it became evident that also small corrections on the yields have a huge impact on the trend obtained in this plane. We double checked this behaviour by studying also the LMC obtaining the same results. We can conclude that this plot has to be used with caution keeping in mind some caveats: the most important ones are related to the nuclosynthesis aspects that introduce systematics that I will discuss. |