Abstract
| Gran |
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| Probing the early accretion history of the Milky Way with extremely metal-poor stars |
| Extremely metal-poor stars ([Fe/H] < −3 dex) are witnesses of the first stages of galaxy formation, and their chemical composition is likely the result of the nucleosynthesis of the first generations of stars. They offer unique insight into the conditions in the young Universe in which they were born, solely 2-3 Gyr after the Big Bang. In particular, the accretion events that built up our Galaxy (Gaia-Sausage-Enceladus, Sequoia, Thamnos, Pontus, among others) were primarily discovered using dynamical features; however, they can be better understood by studying the neutron-capture elements (Sr, Y, Zr and Ba, La, Nd, Eu) in their extremely metal-poor stars. Using the first Pristine data release, a high-resolution follow-up of bright (G < 13.5 mag), extremely metal-poor stars was performed with UVES@VLT, aimed to characterise the early Galaxy. This talk will introduce metal-poor stars as the most primitive stellar objects in the Milky Way and present this Pristine golden sample first characterisation, describing the chemo-dynamical signatures observed in the sample. |