Speaker: Maria Luiza Linhares Dantas (Nicolaus Copernicus Astronomical Center, Warsaw)
Title: A tale of old super metal-rich stars
Abstract:
During this presentation, I will describe the work I developed during the past ~1.5 yr in the scope of the Gaia-ESO survey, which has recently been made completely public (Randich et al. 2022 A&A accepted; Gilmore et al. 2022 A&A submitted). I will focus this presentation on a sample of old super metal-rich stars currently inhabiting the Solar vicinity analysed in Dantas et al. (2022a, A&A in review). Several chemo-dynamic parameters (along with their ages and super-metallicity) indicate that they have migrated from the inner regions of the Milky Way, including orbits of low eccentricity (e≲0.2), maximum height from the Galactic plane between ~0.5-1.5 kpc, and lack of radial metallicity gradient. These results are in accordance with several other works in the literature (e.g. Kordopatis et al. 2015) and predictions from simulations (e.g. Khorpeskov et al. 2020). I will end my presentation by showing an additional analysis of the effects of radial migration on lithium abundances of these stars which will be submitted in the shape of a letter (Dantas et al. 2022b, A&A letters - to be submitted).
Room: Sala de Reuniões e Seminários (2-8.3) (2nd Floor of Physics Building)