Good Vibrations Seminar #6: Amalie Stokholm (SAC, Aarhus University)

March 24, 2021 | 10:00 am 11:00 am
CET, Aarhus, Denmark

Chronology of the Galactic disk with Asteroseismology

Amalie Stokholm (SAC, Aarhus University)

The Milky Way galaxy has been shaped by different processes throughout its life, affecting its shining elements: the stars. Stars carry signatures of the conditions in their birth environment and of their subsequent history, meaning we can use the stars as fossil records to reconstruct the evolution of the Milky Way. We can also use the constraints on in-situ formation of external galaxies, where individual stars cannot be resolved and this kind of study is impossible.
One challenge is to achieve the necessary accuracy in stellar parameters for a representative number of stars. Determining physical properties of stars such as mass, radius, and especially age is remarkably difficult using traditional techniques. In the last few decades, the study of stellar pulsations or asteroseismology has led to a dramatic development in the precise measure of stellar parameters. Stellar pulsations are directly related to the internal properties of stars and thus to the nuclear processes in the stellar interior, based on which relatively precise stellar ages can be determined.
I have compiled the largest ensemble of red giant stars to date with measured elemental abundances, astrometric quantities, and precise ages from asteroseismology. The aim of my project is to build a chronology of the Milky Way galaxy and study the age aspect of the chemical and kinematic features of the Galactic disk. Using a data-driven clustering algorithm, I am looking at the similarities and differences between stars born at different epochs, studying the signatures of events in the Milky Way’s past.

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