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Search for chemical clocks with TESS and APOGEE

Thibault Boulet

The formation history and evolution of the Milky Way through cosmological time is a complex field of research requiring the sampling of highly accurate and reliable stellar ages for all the components of the Galaxy. Such highly reliable ages are starting to become available due to the synergy between asteroseismology, spectroscopy, and stellar modeling in the era of all-sky astronomical surveys. Based on a sample of 227 red giants in the Galactic disk sampled from the TESS Southern Continuous Viewing Zone, with a mean relative uncertainty on the stellar age of 22% and precise chemical abundances from APOGEE DR16, we aim at finding the best possible Galactic chemical clocks. We proceed by comparing the evolution of the abundance ratios to those predicted by state-of-the-art Galactic evolution models. We identified new chemical clocks ratios that have not been previously considered in the literature and we investigate the non-universality of chemical clocks by taking into account the birth radius across the Galactic disk for stars in our sample.

2021 October 01, 13:30

Online broadcast (Zoom)

Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia