ChronoGal: Unveiling the secrets of our Galaxy through stellar ages from Gaia Colour-Magnitude Diagrams

Ruiz-Lara, Tomás; Gallart, Carme; Fernández-Albar, Emma; Cassisi, Santi
Bibliographical reference

EAS2024

Advertised on:
7
2024
Number of authors
4
IAC number of authors
2
Citations
0
Refereed citations
0
Description
The derivation of precise stellar ages is considered the current major challenge to reconstruct the chronological chain of events that shaped the Milky Way (MW). Despite much effort and hope have been deposited in upcoming asteroseismology works, we have shown that CMD-fitting already offers an alternative to age determinations via the derivation of global star formation histories (SFH). ChronoGal (Chronology of our Galaxy from Gaia Colour-Magnitude Diagram -CMD- fitting) is a real avenue to compute stellar age and metallicity distributions for vast samples of stars from the solar neighbourhood using current Gaia data releases. Improving upon our previous works (Gallart et al. 2019, Ruiz-Lara et al. 2020), in this talk we present our updated set of routines to obtain SFHs from Gaia CMDs ('CMDft.Gaia'). We will discuss our first results including the first SFH of an accreted system, the Helmi Streams (Ruiz-Lara et al. 2022), and the most precise characterisation of the solar neighbourhood (Gallart et al. 2024). Finally, we will also reconstruct the most complete view on our Galaxy's past dicussing the early effects of the Gaia-Enceladus-Saussage merger, the formation and evolution of the MW's bar, the differences between thin/thick disc SFHs, or the existence of the recently proposed metal-poor disc. This is just the tip of the iceberg of what ChronoGal can contribute to Galactic Archaeology studies. We want to use this Symposium as a forum to discuss possible pathways to follow.