Astronomy and Space Physics

Diane Feuillet (Lund University): Characterizing epochs of star formation across the Milky Way disc using age-metallicity distributions of GALAH stars

Name: Diane Feuillet (Lund University): Characterizing epochs of star formation across the Milky Way disc using age-metallicity distributions of GALAH stars
Start: 2023-02-16T14:00:00+01:00
End: 2023-02-16T15:00:00+01:00
Location: Ångströmlaboratoriet

Thursday 16 Feb 2023, 14:00 → 15:00 Europe/Stockholm

101132 (Ångströmlaboratoriet)

101132

Ångströmlaboratoriet

Description

Title: Characterizing epochs of star formation across the Milky Way disc using age-metallicity distributions of GALAH stars
Speaker: Diane Feuillet
Affiliation: Lund University
Time: Thursday 16 February 2023, 1400 to 1500
Location: 101132Å

Abstract:

The age-metallicity relation of a galaxy is predicted to reflect its star formation history, providing significant insight into the galaxy’s evolution. However, the observed age-metallicity relation of the Milky Way disk has historically been confusingly featureless, showing little correlation between the age and metallicity of stars. Recently, larger datasets and new statistical analysis methods have revealed significant detail and complexity in the age-metallicity relation of the Milky Way disk. We present a detailed map of the ages and metallicities of turn-off stars in the Milky Way disk based on data from GALAH DR3 and Gaia EDR3. From this map, we identify previously undetected features in the age-metallicity distribution of disc stars and interpret these results as indicating a three-phase formation history of the Milky Way.